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3.3 Types of chemical reactions

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Question 36

A technician tests two treatments on separate samples of acidic waste water.

SamplepH before treatmentpH after treatment
R25
S46

A student claims that sample S had the greater factor decrease in hydrogen ion concentration because it had the higher final pH.

Evaluate the student's claim. Use the data in the table.

[3]
Markscheme

3.3 Types of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.3 Types of chemical reactions

112 exam-style questions on OCR GCSE Chemistry 3.3 Types of chemical reactions, covering 3.3.1 Oxidation and reduction in terms of oxygen, 3.3.2 Acids, alkalis and neutralisation, 3.3.3 The pH scale and measuring pH, 3.3.4 Oxidation and reduction in terms of electrons, 3.3.5 Dilute and concentrated, weak and strong acids, and 3.3.6 Hydrogen ion concentration and pH. Each one has a worked solution and a mark scheme showing where the marks go.

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