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  1. Problems
  2. /Acids, Bases and Salts

Acids, Bases and Salts

Chemistry
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30 problems
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1.
In a titration, 20.0 mL of sodium hydroxide solution needs 15.0 mL of 0.100 M hydrochloric acid to…
High School (9–10), General · pH and NeutralisationStemPy LabStemPy Lab
Hard
2.
What volume of 0.10 M sulphuric acid neutralises 36 mL of 0.15 M sodium hydroxide?
High School (9–10), General · pH and NeutralisationStemPy LabStemPy Lab
Medium
3.
What volume of 0.25 M hydrochloric acid neutralises 45 mL of 0.10 M sodium hydroxide?
High School (9–10), General · pH and NeutralisationStemPy LabStemPy Lab
Easy
4.
How many antacid tablets, each with 0.50 g of magnesium hydroxide, are needed to neutralise 250 mL…
High School (9–10), General · pH and Neutralisation, Acids and BasesStemPy LabStemPy Lab
Medium
5.
A bee sting has methanoic acid. What would you rub on it, and why?
High School (9–10), General · pH and Neutralisation, Acids and BasesStemPy LabStemPy Lab
Easy
6.
Explain how tooth decay begins, and why brushing with toothpaste helps.
High School (9–10), General · pH and Neutralisation, Acids and BasesStemPy LabStemPy Lab
Medium
7.
Write the equation for the neutralisation of stomach acid by magnesium hydroxide.
High School (9–10), General · pH and Neutralisation, Acids and BasesStemPy LabStemPy Lab
Medium
8.
An acid has a pH of 3. It is diluted to 1000 times its volume with water.
High School (9–10), General · pH and NeutralisationStemPy LabStemPy Lab
Medium
9.
Find the pH of 0.0002 M hydrochloric acid and of 0.0005 M sodium hydroxide.
High School (9–10), General · pH and NeutralisationStemPy LabStemPy Lab
Medium
10.
Say whether each solution is acidic, neutral or basic, and which is the strongest acid.
High School (9–10), General · pH and NeutralisationStemPy LabStemPy Lab
Easy
11.
516 g of gypsum, CaSO₄ · 2H₂O (172 g/mol), is heated to 373 K.
High School (9–10), General · Salts and Their UsesStemPy LabStemPy Lab
Medium
12.
Washing soda is Na₂CO₃ · 10H₂O. Use Na = 23, C = 12, O = 16 and H = 1.
High School (9–10), General · Salts and Their UsesStemPy LabStemPy Lab
Medium
13.
9.98 g of blue copper sulphate, CuSO₄ · 5H₂O (249.5 g/mol), is heated until it is white.
High School (9–10), General · Salts and Their UsesStemPy LabStemPy Lab
Medium
14.
How is bleaching powder made? Write the equation, and give three uses of it.
High School (9–10), General · Salts and Their UsesStemPy LabStemPy Lab
Easy
15.
Why do bakers use baking powder, and not baking soda alone, in a cake?
High School (9–10), General · Salts and Their UsesStemPy LabStemPy Lab
Medium
16.
146.25 g of sodium chloride is electrolysed in brine: 2NaCl + 2H₂O → 2NaOH + Cl₂ + H₂.
High School (9–10), General · Salts and Their UsesStemPy LabStemPy Lab
Medium
17.
What is made when electricity is passed through brine?
High School (9–10), General · Salts and Their UsesStemPy LabStemPy Lab
Medium
18.
Sort these salts into the chlorides, the sulphates and the sodium salts.
High School (9–10), General · Salts and Their UsesStemPy LabStemPy Lab
Easy
19.
Is the solution of each salt acidic, neutral or basic?
High School (9–10), General · Salts and Their UsesStemPy LabStemPy Lab
Medium
20.
Name the salt made in each reaction, and write its formula.
High School (9–10), General · Salts and Their UsesStemPy LabStemPy Lab
Easy
21.
Methane, CH₄, and ammonia, NH₃, both contain hydrogen.
High School (9–10), General · Acids and BasesStemPy LabStemPy Lab
Hard
22.
Why must we always add a concentrated acid to water, slowly and with stirring, and never water to…
High School (9–10), General · Acids and BasesStemPy LabStemPy Lab
Easy
23.
25 mL of 0.02 M hydrochloric acid is made up to 500 mL with water.
High School (9–10), General · Acids and BasesStemPy LabStemPy Lab
Medium
24.
Dry hydrogen chloride gas does not change dry blue litmus paper, but it turns damp blue litmus red.
High School (9–10), General · Acids and BasesStemPy LabStemPy Lab
Medium
25.
Carbon dioxide is passed through lime water for a short time, and it turns milky.
High School (9–10), General · Acids and BasesStemPy LabStemPy Lab
Medium
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