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Chemistry
10th -
11thgrade
6.5 Concentration of Aqueous Solution 6.6 Standard Solution
10 questions
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- 1. Multiple Choice
What is the mass of sodium hydroxide present in 100 cm3 of 2.0 mol/dm3 sodium hydroxide solution? [Relative atomic mass: H = 1, O=16, Na = 23]
2.0 g
4.0 g
8.0 g
10.0 g
- 2. Multiple Choice
What is the mass of potassium hydroxide needed to prepare 250 cm3 of 0.5 mol/dm3 standard solution? [Relative atomic mass: H = 1, O =16, K=39]
7 g
14 g
21 g
28 g
- 3. Multiple Choice
What is the mass of sodium nitrate, NaNO3 needed to prepare 500 cm3 of 0.1 mol/dm3 sodium nitrate solution? [Relative atomic mass: N=14, O=16, Na=23]
2.125 g
4.25 g
8.50 g
17.0 g
- 4. Multiple Choice
Excess zinc is reacted with 100 cm3 of 2 mol/dm3 hydrochloric acid. What is the volume of hydrogen gas formed at standard temperature and pressure, STP? [Molar volume of gas is 22.4 dm3/mol at STP]
1.12 dm3
2.24 dm3
3.36 dm3
4.48 dm3
- 5. Multiple Choice
When 14 g of KOH is dissolved in V cm3 of water, a solution with a concentration of 0.5 mol/dm3 is obtained. Determine the value of V. [Relative atomic mass: H=1, O=16, K=39]
100 cm3
200 cm3
250 cm3
500 cm3
- 6. Multiple Choice
Calculate the volume of sulphuric acid, H2SO4 of 2.0 mol/dm3 needed for dilution to produce 200 cm3 of 1.0 mol/dm3 of sulphuric acid.
50 cm3
100 cm3
200 cm3
400 cm3
- 7. Multiple Choice
100 cm3 of distilled water is added to 400 cm3 of 2.0 mol/dm3 hydrochloric acid. What is the molarity of the solution formed?
1.6 mol/dm3
1.8 mol/dm3
2.0 mol/dm3
2.5 mol/dm3
- 8. Multiple Choice
Which of the following contains most numbers of hydrogen ions?
400 cm3 of 1.0 mol/dm3 of sulphuric acid
700 cm3 of 1.0 mol/dm3 of ethanoic acid
600 cm3 of 1.0 mol/dm3 of hydrochloric acid
400 cm3 of sodium hydroxide 1.0 mol/dm3
- 9. Multiple Choice
A salt X solution has a concentration of 30.25 g/dm3. Its molarity is 0.5 mol/dm3. Calculate the relative formula mass for salt X.
0.0165
15.125
60.5
141
- 10. Multiple Choice
Molarity of a bottle of potassium hydroxide is 1.5 mol/dm3. What is the concentration in g/dm3? [Relative atomic mass: K=39, H=1, O=16]
25
50
84
90
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