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Paper 2 H - SAMPLE SET 1 Q19 Answers

19) Sarah does three titrations with dilute hydrochloric acid and potassium hydroxide solution.
Hydrochloric acid neutralises the alkali potassium hydroxide
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Look at the apparatus she uses.
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Look at the diagrams. They show parts of the burette during the first titration.
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Here is Sarah’s results table:
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(a) Use the diagrams and table to help you calculate the mean titre.
Explain your answer. [2]

Mean titre = …………….. cm3

(b) Sarah uses 25.0 cm3 of potassium hydroxide solution, KOH.
She also uses hydrochloric acid with a concentration of 0.100 mol/dm3.
Calculate the concentration, in mol/dm3, of the KOH(aq). [2]

Concentration of KOH(aq) = ………………….. mol/dm3

(c) Use your answer to (b) to calculate the concentration of the KOH(aq) in g/dm3.

Concentration of KOH(aq) = ………………….. g/dm3



​​​​(Total for Question 19 = 6 marks)


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