A scientist does two tests on four white solids - AQA - GCSE Chemistry Combined Science - Question 7 - 2018 - Paper 1

To find the value of X:

1. Initial solution B volume: 10 cm³ with a pH of 3.

2. Final volume in beaker: 1000 cm³ after adding distilled water.

3. Calculating dilution factor: The solution is diluted by a factor of 100 since:

   egin{align*} ext{Dilution factor} &= rac{ ext{Final volume (1000 cm³)}}{ ext{Initial volume (10 cm³)}} = 100 ext{pH increases by 1 unit for each dilution by a factor of 10, hence:} ext{Initial pH of 3 means:} ext{Final pH} = 3 + 2 = 5 ext{So, } X = 5. \ ext{Thus, the value of } X = 5. " }