Investigating the Concentrations of Unknown Acids

Investigating the Concentrations of Unknown Acids

Length: 954 words (2.7 double-spaced pages)

Rating: Excellent

Open Document

Essay Preview

More ↓
Investigating the Concentrations of Unknown Acids

Aim

To find out each of the concentrations of the hydrochloric acids in
the Winchesters labelled A-E. This is going to be carries out by
titrating the acid with NaOH.

Equipment needed for this investigation

Pipette - 25ml

Burette

Phenolphthalein

Conical flask

Beaker

Funnel

Pipette filler

Clamp

NaOH - the known acid of 0.1M

HCl - the unknown concentration of acids

White tile

My predictions

I predict that the different acid solutions of the HCl will be less
than 0.1M because the Winchesters were topped up with water, which
would have obviously weakened the concentration of the acid making the
number of moles less than 0.1.

Safety precautions when doing the experiment:

v The equipment should be used carefully to prevent breakage of any
glass.

v The acids should be used carefully avoiding spillages and if any
acid came into contact it should be rinsed with water immediately to
prevent any irritation to the skin.

Planning

All the equipment is gathered together first and made sure that it is
clean and safe to use.

25ml of the unknown concentration of the HCl is measured using a
pipette and taken using a pipette filler, the liquid is then drained
into a clean conical flask. 3 drops of phenolphthalein indicator is
added to 25ml of HCl.

The burette is securely placed onto the clamp and the NaOH is poured
into the burette using a funnel and making sure that the tap at the
bottom is closed. The conical flask containing the HCl and
Phenolphthalein is placed on a white tile at the bottom end of the
burette.

The tap of the burette is opened to slowly release the NaOH while
swirling the conical flask to combine the two acids. The NaOH is
steadily added until the solution in the conical flask turns a pale
pink colour. If the solution stays the pale pink for up to 20 seconds

How to Cite this Page

MLA Citation:
"Investigating the Concentrations of Unknown Acids." 123HelpMe.com. 23 Jan 2020
    <https://www.123helpme.com/view.asp?id=149195>.

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Investigating The Concentration Of An Unknown Solution Of Tartrazine Essay

- Introduction Chemical compounds absorb, transmit or reflect light. They do this over a range of wavelengths through spectrophotometry. Spectrophotometry measures the amount of any chemical substance which is absorbed or transmitted. A spectrophotometer is an apparatus used to measure the intensity of light after passing through a solution. Visible spectrophotometers use light over the ultra violet range 185-400nm and visible range of 400-700nm of electromagnetic radiation. When using visible spectrophotometry to determine absorption or transmission you need to observe the colour of the solution....   [tags: Chemistry, Concentration]

Research Papers
1172 words (3.3 pages)

The Concentration Of An Unknown Species Essay

- Titration is a process by which the concentration of an unknown species is determined by reacting a certain amount of the unknown with another substance. It relies on the unknown being acidic or basic, and on the change of color of an indcator when the unknown is neutralized. Titration is used in medicine to determine the concentration of certain chemicals in blood or urine. It’s also used in IV drips to figure out the correct proportion of various drugs added, and in pharmaceuticals to correctly mix the right proportion of drugs.1 In this experiment, a strong acid, HCl, and a strong base, NaOH are used....   [tags: Titration, PH indicator, Equivalence point, PH]

Research Papers
1413 words (4 pages)

Understanding Acids and Bases Essay

- Part A: Background information: Acids and bases are currently used in many various ways in our society and it is very important in daily uses. To many industries, acids and bases are a common factor as it is used to make fertilizer, cleaning supplies, or even sources of food or medicines to provide an easy life style. Acid is a substance with particular chemical properties, acids reacts with certain metals to produce hydrogen gas, acids also reacts with carbonate and bicarbonates to produce carbon dioxide gas, it has a sour taste....   [tags: Acids vs Bases]

Research Papers
3020 words (8.6 pages)

Essay on The Rate of Reaction Of Metals with Acids

- The Rate of Reaction Of Metals with Acids Introduction In this investigation I will be looking at the rate of reaction between a metal, which will be magnesium ribbon, and an acid. The acids will either be hydrochloric, ethanoic, sulphuric or phosphoric acid. I will be finding out if the activation energy changes depending on whether a strong or weak acid is used. I will also be investigating whether or not there is a change in the order of reaction if a dibasic acid is used instead of a monobasic acid....   [tags: GCSE Chemistry Coursework Investigation]

Free Essays
2974 words (8.5 pages)

Investigating the Effects of Sodium Concentrations Have on the Rate of Photosynthesis

- Investigating the Effects of Sodium Concentrations Have on the Rate of Photosynthesis Aim: To investigate the effects that different concentrations of sodium hydrogen carbonate on the rate of photosynthesis. Plan: Background Research ------------------- Photosynthesis Equation: Light energy & chlorophyll [IMAGE]6CO2 + 6H2O C6H12O6 + 6O2 ================================ Factors ======= The resistance of a wire depends on certain factors. Some of these variables are listed below: · Light Wavelength · Carbon Dioxide (sodium hydrogen carbonated) · Temperature · Water All these factors will have to be kept constant except the...   [tags: Papers]

Free Essays
605 words (1.7 pages)

Investigating How Different Concentrations Affect the Rate of Reaction Essay examples

- Investigating How Different Concentrations Affect the Rate of Reaction In this investigation I am investigating the effect of one factor on the rate at which calcium carbonate reacts with hydrochloric acid. I have decided to change the concentration of the acid to investigate how different concentrations affect the rate of reaction, and to discover what amount, at which concentration releases a higher quantity of gas. There are other factors, which could have been used as the variables....   [tags: Papers]

Free Essays
1529 words (4.4 pages)

Investigating Osmosis in Potatoes at Different Concentrations of Sucrose Solutions

- Investigating Osmosis in Potatoes at Different Concentrations of Sucrose Solutions Planning Aim: The aim of this experiment is to find out how solutions of different strength affect the osmotic movement. Preliminary work: For the preliminary work, I did a try out test to see if the method I had works. Also, I wanted to use the results I have after completing the experiment so that I can have an overview of how sucrose solutions of different strengths affect the diffusion of water in potato chips....   [tags: Papers]

Free Essays
2740 words (7.8 pages)

Investigating the Concentration of Citric Acid Essay

- Investigating the Concentration of Citric Acid Problem ------- I have been set the task of determining the concentration of a sample of citric acid, using only a 1.0 M solution of sodium hydroxide and any laboratory glassware that is required. I have also been given the RMM of citric acid as 210g and I have been told that one mole of citric acid will react with 3 moles of sodium hydroxide. My Experiment ------------- Using this information I have determined that the best way to conduct this experiment is to do a titration....   [tags: Papers]

Free Essays
1229 words (3.5 pages)

Essay on Investigating The Affect of Concentration on The Rate of Reaction

- Investigating The Affect of Concentration on The Rate of Reaction Aim- To find out if changing the concentration of the hydrochloric acid affects the volume of gas released in 5 minutes. Background Information The rate of reaction depends on four things:- 1. Temperature 2. Concentration 3. Catalyst 4. Size of particles/surface area The Collision Theory The collision theory explains the rates of reaction, the rate of reaction depends on how often and how hard the reacting particles collide with each other....   [tags: GCSE Chemistry Coursework Investigation]

Free Essays
2090 words (6 pages)

Essay on Investigating the Effect of Concentration on Rate of Reaction

- Investigating the Effect of Concentration on Rate of Reaction Aim The investigation is about the effect of concentration on the rate of chemical reaction. In this experiment I am going to investigate the rate of reaction of sodium litho sulphate with hydrochloric acid. The reaction that I will use is: Sodium litho sulphate + Hydrochloric Acid Na2S2O3 + 2HCl Variables ========= I will change the concentration of hydrochloric acid each time. I will use hydrochloric acid 0.1M, 0.25M, 0.50M, 0.75M and 1M....   [tags: Papers]

Free Essays
1110 words (3.2 pages)

Related Searches

then it is permanent even if it goes back to being colourless after a
while. The pale pink shows that the acid (HCl) was neutralised by the
alkalis (NaOH). The burette was then read to see how much NaOH was
needed to neutralise the 25ml of HCl.

I am going to do some preliminary tests before hand to prepare me for
the real experiments, which will enable me to have a bit more practice
on taking the measurements and using the new equipment, which will
help me to improve in my investigation.

To make this a fair investigation I am going to carry out the method
on each unknown acid of HCl at least 3 times to prevent any unreliable
results. By doing this more than once I will be able to produce an
average for each result. I will also spot any anomalies in my results
to show where I might have gone wrong to improve on my
experimentations next time. I am going to take the readings of the
liquids to 2 decimal places to again obtain a more accurate and
reliable collection of results.

Results

Acid A

1st try

2nd try

3rd try

Initial reading of the NaOH (ml)

0.00

0.00

0.00

Final reading (ml)

25.30

25.35

25.45

Average result: 25.37ml

Acid B

1st try

2nd try

3rd try

Initial reading of the NaOH (ml)

0.00

0.00

0.00

Final reading (ml)

23.95

23.90

23.85

Average result: 23.90ml

Acid C

1st try

2nd try

3rd try

Initial reading of the NaOH (ml)

0.00

0.00

0.00

Final reading (ml)

22.85

22.70

22.75

Average result: 22.77ml

Acid D

1st try

2nd try

3rd try

Initial reading of the NaOH (ml)

0.00

0.00

0.00

Final reading (ml)

19.85

19.95

19.90

Average result: 19.90

Acid E

1st try

2nd try

3rd try

Initial reading of the NaOH (ml)

0.00

0.00

0.00

Final reading (ml)

17.30

17.35

17.45

Average result: 17.37

Averages of the acids

Acid A

Acid B

Acid C

Acid D

Acid E

Amount of NaOH used to neutralise the HCl (ml)

25.37

23.90

22.77

19.90

17.37

Calculating the concentrations of the acids in moles:

Acid A

0.1M x 25.37 - moles in titre

1000ml

= 2.537 x 10 x 1000

25

=0.10 2.d.p

Step by step of the calculations above

There is 0.1M in a 1000ml and so in 1ml of the NaOH there are 0.1
moles,

1000

we can then find out how many moles of NaOH we used. It is then
multiplied by 25.37 which is the amount of NaOH that was used and is
also divided by 25 because that is how much of the HCl that was used
every time. The whole sum is then multiplies by 1000 to show the
amount of moles in 1000ml of the NaOH which is needed to neutralise
the acid.

The number of moles in the NaOH is also the same as the HCl because I
know from the equation below that they have a one to one relationship,
which means for every 1M of NaOH, there is 1M of HCl.

HCl + NaOH ---------- NaCl + H20

Acid + alkalis ---------- salt + water

Final results

The concentration of the acid to 2.d.p (moles)

Acid A

0.10

Acid B

0.10

Acid C

0.09

Acid D

0.08

Acid E

0.07

Evaluation

The results of the investigation did not exactly meet my prediction of
the HCl concentrations being less than 0.1M because it had been topped
up with water, weakening its concentration. This is because the HCl
had a higher concentration than 0.1M to start with, which could have
been the fault of the technician who topped up the Winchesters.

I do believe that my sets of results are very reliable considering
that they were all tested fairly and carries out several times to
produce a better, more accurate set of results. The 3 results of each
concentration of the acids were also very close to each other which
shows that each time the test was carried out they were performed
accurately with only a slight difference to each other. There are no
major anomalies in my results which may also show that all the tests
were done carefully and each one was successful and reliable.

On each time the experiment was performed, the end point at which the
acid was neutralised by the alkalis was always carefully done without
pouring too much of the NaOH into the flask which could have made it
alkalis and turn the colour a deep pink. The easiest way I found to be
able to reach that point is before the acid was about to be
neutralised, small drops of the NaOH was added slowly until it turned
pale pink and stayed for at least 20 seconds. I did not have any
difficulty in reaching the end point and managed to create a pale pink
coloured solution each time.

I didn't find any major problems apart from the pipette fillers which
would sometimes make air bubbles in the pipettes as it was measuring
and taking the HCl.

The investigation can be improved by taking further results of each
concentration of the HCl to produce an even more accurate and reliable
source of results. Better equipment can also be used and different
kinds of equipment to see if they give accurate readings to 2 decimal
places.
Return to 123HelpMe.com