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Edexcel IAL Chemistry 14.13 pH data from acid and base experiments

Read the table or ranking first, then connect pH differences to complete dissociation, partial dissociation, dilution behaviour or hydroxide ion production.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Explain why tenfold dilution changes strong-acid pH by 1 but weak-acid pH by less.
  • Rank base pH by strength, concentration and the number of hydroxide ions produced.

14.13—Analyse data from the following experiments: i measuring the pH of a variety of substances question 1

[Maximum number: 1]

Four beakers each contain equal volumes of four solutions.
Beaker 1 contains 0.01 moldm−3NaOH0.01 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{NaOH}
Beaker 2 contains 0.01 moldm−3NH30.01 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{NH}_{3}
Beaker 3 contains 0.1 moldm−3NaOH0.1 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{NaOH}
Beaker 4 contains 0.1 moldm−3Ba(OH)20.1 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{Ba}(\mathrm{OH})_{2}
The pH of the four solutions was measured.
Which of the following gives the order of decreasing pH?
A1,2,3,4
B2, 1, 3, 4

C

3,4,1,2

D

4,3,1,2

A

1, 2, 3, 4

B

2, 1, 3, 4

C

3, 4, 1, 2

D

4, 3, 1, 2

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