Question

A soda ash is analyzed in the analytical chemistry laboratory by titration with standard hydrochloric acid. The analysis is performed in triplicate with the following results: 93.50, 93.58, 93.43% Na2CO3. Within what range are you 95% confident that the true value lies?​

Answer 1

Answer:

We are  95% confident that the true value lies between 93.50 ± 2 %

Explanation:

Given data

Titration results

1. 93.50 %
2. 93.58 %
3. 93.43 %

To find a cofident range we calculate the average of these three values

   average = (93.50 % + 93.58 % + 93.43 %) ÷ 3

   average = 280 % ÷ 3

   average = 93.50 %

We are  95% confident that the true value lies between 93.50 ± 2 %