Try this as often as you like. You will get a different set of questions each time you attempt this quiz.
A concentrated solution is one which
has a large amount of solute compared to the amount of solvent.
has a large amount of solvent compared to the amount of solute.
has equal amounts of solute and solvent.
reacts readily with an acid or a base.
A student was asked to make up a 10% w/v solution of sodim carbonate. Which one of the following methods should have been followed?
Dissolve 10 g of the sodium carbonate in water and make up to a volume of 100 cm^{3} in a volumetric flask by adding more water.
Dissolve 10 g of the sodium carbonate in exactly 100 cm^{3} of water.
Dissolve 10 g of the sodium carbonate in water and make up to a volume of 1litre in a volumetric flask by adding more water.
Dissolve 10 g of the sodium carbonate in water and make up to a mass of 100 grams by adding more water.
A bottle of whiskey is labelled 43% v/v of ethanol. This means that
there are 430 ml of ethanol in every litre of the whiskey.
there are 43 g of ethanol in every 100 g of the whiskey.
there are 43 g of ethanol in every 100 ml of the whiskey.
there are 430 ml of ethanol in every 1000 g of the whiskey.
A bottle labelled 20% CuSO_{4} contains 200 ml of the solution. How many grams of CuSO_{4} are there present in this solution?
40 g
20 g
200 g
4000 g
A certain bottle of mineral water has a stated chloride concentration of 28 ppm. How many mg of chlorides are present in a 250 ml bottle of this water?
7 mg
28 mg
112 mg
0.007 mg
In a water treatment plant, a chemist found that a water sample contains 0.009 g of calcium carbonate in a volume of 1 litre. What is this concentration expressed as ppm?
9 ppm
0.009 ppm
0.9 ppm
0.000009 ppm
Which one of the following would best describe a molar solution?
A solution that contains one mole of solute dissolved in a litre of solution.
A solution that contains one mole of solute dissolved in a mole of solvent.
A solution that contains 100 g of solute dissolved in one mole of solution.
A solution that contains one mole of solute dissolved in 100 cm^{3} of solution.
A 250 ml volumetric flask contains a 0.1 molar solution of sodium hydroxide (NaOH). How many grams of sodium hydroxide are there in this volume of solution? {M_{r}(NaOH) = 40}
1 g
40 g
10 g
4 g
A solution of sulfuric acid (M_{r} = 98) consists of 49 g of pure acid dissolved to make up a solution of volume 200 cm^{3}. What is the concentration of this acid solution?
2.5 mol/litre
0.5 mol/litre
24.5 mol/litre
0.245 mol/litre
How many moles of sodium hydroxide (NaOH) are there in 250 ml of a 0.1 molar solution of sodium hydroxide?
0.025 mole
25 moles
4 moles
2.5 moles
Calcium and hydrochloric acid react together according to the equation Ca + 2HCl → CaCl_{2} + H_{2} What mass of calcium will completely react with 200 ml of 0.1 M HCl solution? A_{r}(Ca) = 40
0.4 gram
0.8 gram
0.02 gram
4 grams
A litre of concentrated hydrochloric acid (HCl) is spilt in the laboratory. If the concentration of the acid is 10 M, how much calcium carbonate (CaCO_{3}) powder is needed to neutralise the spilt acid? {M_{r}(CaCO_{3}) = 100}
1 kg
100 g
10 g
0.01 g
If 25 ml of 0.1 M solution of HCl was diluted to a volume of 500 ml, what is the new concentration of the HCl solution?
0.005 M
0.05 M
20 M
200 M
Which TWO of the following processes will increase the concentration of a solution? (a) Increase the amount of solute. (b) Decrease the amount of solute. (c) Increase the amount of solvent. (d) Decrease the amount of solvent.
(a) and (d)
(a) and (c)
(b) and (d)
(a) and (b)
The concentration of a solution may be obtained by titrating it against a primary standard solution. Which one of the following conditions is NOT necessary when choosing a primary standard?
It should form a colourless solution.
It should have a relatively high molecular mass.
It should not react with the air.
It should not contain water of crystallisation.
Which one of the following solutions could NOT be used as a primary standard solution?
Sodium hydroxide (NaOH)
Anhydrous sodium carbonate (Na_{2}CO_{3})
Sodium chloride (NaCl)
Potassium dichromate (K_{2}Cr_{2}O_{7})
The relative molecular mass of sodium carbonate (Na_{2}CO_{3}) is 106. If 5.3 grams of anhydrous sodium carbonate is dissolved in deionised water and made up tp 500 ml in a volumetric flask, what will its concentration be?
0.1 molar
1.0 molar
0.5 molar
0.05 molar
Before performing a titration, two pieces of apparatus should be washed out with the solutions they are to contain. What are these two pieces of apparatus?
Burette and pipette
Pipette and conical flask
Conical flask and funnel
Burette and funnel
The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) can be described by the equation: HCl + NaOH → NaCl +H_{2}O If 100 ml of a solution of hydrochloric acid solution contains 0.01 mole of the acid, then what volume of 0.05 molar sodium hydroxide will exactly neutralise the acid?
200 ml
20 ml
50 ml
5 ml
Which one of the following statements is true for the methyl orange indicator?
It is yellow in basic solutions and red in acidic solutions.
It is yellow in basic solutions and orange in acidic solutions.
It is blue in basic solutions and red in acidic solutions.
It is orange in basic solutions and pink in acidic solutions.
A student carried out four titrations between an acid and a base. The volumes of acid required to neutralise the base were recorded and were as follows: 19.6 cm^{3}, 19.5 cm^{3}, 19.3 cm^{3}, 19.3 cm^{3}. When performing his calculations, what value for voume of acid should he use?
19.30 cm^{3}
19.37 cm^{3}
19.43 cm^{3}
19.55 cm^{3}
In problem-solving involving volumetric analysis, which one of the following equations should be used?
The concentration of a potassium hydroxide (KOH) solution was found to be 0.14 mol/l. If the molar mass of potassium hydroxide is 56, what is the concentration of this solution in grams/l?
7.84 g/l
4 g/l
400 g/l
56.14 g/l
A sample of vinegar was analysed and found to have a concentration of ethanoic acid equal to 1 mol/l. What will its concentration be expressed as % w/v? M_{r}(ethanoic acid) = 60
6% w/v
1% w/v
60% w/v
61% w/v
The water of crystallisation in sodium carbonate may be determined by titration. Which one of the following statements about water of crystallisation is incorrect?
All crystals contain water of crystallisation.
A crystal is said to be dehydrated if it loses its water of crystallisation.
The value of X in the formula Na_{2}CO_{3}.XH_{2}O must be a whole number.
The amount of water of crystallisation that occurs in a sample may vary from molecule to molecule.
What is the volume (in cm^{3}) of a 0.800 mol dm^{-3} solution of KOH needed for neutralization in a titration with 30.0 cm^{3} of 0.200 mol dm^{-3} H_{2}SO_{4}?
15.0
60.0
7.5
30.0
What volume of 0.5 mol dm^{3} sulfuric acid solution is required to react completely with 10.0 g of calcium carbonate according to the equation below? CaCO_{3} + H_{2}SO_{4} → CaSO_{4} + H_{2}O + CO_{2}
200 cm^{3}
300 cm^{3}
100 cm^{3}
400 cm^{3}
Which of the following solutions contains the greatest amount of solute?
20.0 cm^{3} of 0.40 mol dm^{−3} NaCl
10.0 cm^{3} of 0.50 mol dm^{−3} NaCl
30.0 cm^{3} of 0.30 mol dm^{−3} NaCl
40.0 cm^{3} of 0.20 mol dm^{−3} NaCl
A 4 g sample of sodium hydroxide (NaOH) is dissolved in water and made up to 500 cm^{3} of aqueous solution. What is the concentration of the resulting solution?
0.2 mol dm^{-3}
0.1 mol dm^{-3}
0.5 mol dm^{-3}
1.0 mol dm^{-3}
Which type of glassware is used in a titration to deliver an accurate volume of a solution to a known volume of another solution?