How the Concentration of Sodium Thiosulphate Influences Speed of Reaction with Dilute Hydrochloric Acid

How the Concentration of Sodium Thiosulphate Influences Speed of Reaction with Dilute Hydrochloric Acid

Length: 540 words (1.5 double-spaced pages)

Rating: Excellent

Open Document

Essay Preview

More ↓
How the Concentration of Sodium Thiosulphate Influences Speed of Reaction with Dilute Hydrochloric Acid

Aim: I am investigating how the concentration of sodium thiosulphate
influences the speed of reaction with dilute hydrochloric acid.



Equipment
=========

* 1 piece of paper with a cross on it

* 1 timer

* 1 conical flask 100ml

* 1 test tube brush

* 119ml Sodium thiosulphate

* 14ml 100% Hydrochloric acid

* 1 beaker 400ml

* 1 beaker 10ml

1. Working with the first dilution I will measure out the solution
and place the Sodium thiosulphate in the conical flask
positioned on top of the paper so the cross is visable from
above, through the neck of the flask. Then I will measure out
and add the water needed in that dilution.

2. As I pour the hydrochloric acid, measured out in the 10ml,
beaker into the conical flask, I will start the timer.

3. I will look vertically down through the neck of the flask, and
stop the timer when the cross can no longer be seen on the paper
through the solution.

4. I will record the time in my results table.

5. I will repeat this for each different dilution (see dilutions
table), and record the results in my results table.

6. After each test I will scrub out the conical flask thoroughly
to ensure there is no contamination that could make my
investigation less accurate or unfair.


Sodium thiosulphate ml
----------------------

How to Cite this Page

MLA Citation:
"How the Concentration of Sodium Thiosulphate Influences Speed of Reaction with Dilute Hydrochloric Acid." 123HelpMe.com. 30 Mar 2020
    <https://www.123helpme.com/view.asp?id=145366>.

Need Writing Help?

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

Check your paper »


Hydrochloric acid ml
--------------------


Water ml
--------


Solution percentage
-------------------

45

5

100%

39.375

4.375

75%

22.5

2.5

50%

11.25

1.25

25%

I worked out how much of each liquid would be required for each
different concentration by working out the percentage of water as a
number of ml out of 50 (the total amount of liquid), and putting the
remaining into the ratio of 45:5, sodium thiosulphate to hydrochloric
acid.

I will make sure my investigation is fair by

* Using the same cross on the same paper every time I do the
experiment so that the thing that had to be seen is kept the same.

* I will scrub my conical flask out thoroughly after each experiment
so no residue from the previous experiment causes view to be
obscured before the next experiments even started.

* I will mark my glassware that contains sodium thiosulphate with a
blue spot so that I do not mix it up or mistakenly put acid in, as
this would prematurely start the reaction and lead to
miscalculations in the timing.

* I will always look down the conical flask vertically through the
neck to the cross, this way I will not be changing the angle or
the depth of fluid I am looking through and making the test
unfair.

* I will always use the same depth of liquid so that the depth does
not effect my results.

* I will not stir any of the beakers.

* As I am investigating the effects of concentration everything else
will be kept constant.

Safety precautions I will take are

· Safety glasses will be worn at all times.

· Long hair will be tied back.

· The workspace will be clear and kept tidy.

· The solutions will be placed suitably where they cannot be knocked
of or that decreases the risk of spillage.

Table of results


Solution %


Time taken (seconds)

100

75

50

25

Prediction:

I predict that the higher the concentration the quicker the cross will
be obscured from view. I think this because the higher the
concentration of solution the more precipitate will be produced, and
so will obscure of the cross more/faster.

By using this method I will be measuring the speed of the reaction,
and so will be able to accurately state how the concentration of
sodium thiosulphate influences the speed of reaction with dilute
hydrochloric acid. I predict the 100% will react the quickest and 25%
the slowest.
Return to 123HelpMe.com