1 markA solution of sulfuric acid, H2SO4, contains 9.8 g of the acid in 250 cm3 of solution.
What is the concentration in mol/dm3?
Relative atomic masses (Ar): H = 1 S = 32 O= 16
0.10 mol/dm3
0.20 mol/dm3
0.40 mol/dm3
0.80 mol/dm3
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1 markHow much solute is present in 2 dm3 of a 0.5 mol/dm3 solution of potassium iodide?
0.5 mol
1.0 mol
2.0 mol
10 mol
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1 markIn a titration 25.00 cm3 of 0.20 mol/dm3 sodium hydroxide reacted with 26.50 cm3 of hydrochloric acid.
HCl + NaOH → NaCl + H2O
What is the concentration of the acid?
0.19 mol/dm3
0.23 mol/dm3
0.55 mol/dm3
0.82 mol/dm3
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1 markA student titrated 25.00 cm3 of 0.40 mol/dm3 potassium hydroxide solution against sulfuric acid and found that 23.55 cm3 of the acid was required to reach the end point.
H2SO4 + 2KOH → K2SO4 + 2H2O
What is the concentration of the sulfuric acid?
0.42 mol/dm3
0.105 mol/dm3
0.35 mol/dm3
0.21 mol/dm3
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1 markSodium hydroxide solution is neutralised by citric acid.
The equation for the reaction is:
C6H8O7 + 3NaOH ⟶ C6H5O7Na3 + 3H2O
Calculate the mass of the citric acid needed to neutralise 12.0 cm3 of 1.02 mol/dm3 sodium hydroxide solution.
Relative formula mass (Mr): C6H8O7 = 192
0.783 g
0. 852 g
1.22 g
2.35g
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