WorksheetsAcids & Bases
Total questions: 15
Worksheet time: 30mins
Which of the following statements are true about acids?
I Acid solutions have pH values less than 7.
II Acids can react with metals to produce hydrogen gas.
III Acids can react with all bases to produce carbon dioxide gas.
IV Acids will change blue litmus paper into red.
I, II and III
I, II and IV
I, III and IV
II, III and IV
Diagram 1 shows the set-up of the apparatus for the reaction between an acid and magnesium. What are the bubbles of gas X?
Oxygen gas
Hydrogen gas
Carbon dioxide
Nitrogen gas
Which of the following are true about bases?
I Bases are oxides and hydroxides of metals.
II Most of the bases are not soluble in water.
III Reaction of bases and water is known as neutralisation.
IV Bases that are soluble in water are known as alkalis.
I, II and III
I, II and IV
I, III and IV
II, III and IV
Which of the following is not true about weak acid?
Weak acids undergo partial ionisation.
Weak acids have low H+ ion concentration.
Weak acids are monobasic acids.
Weak acids dissociate partially in water.
Table 2 shows the pH of four solutions. Which of the solutions can dissociates completely to OH– ions in water?
P
Q
R
S
Two drops of universal indicator are added to a solution in test tube. The solution turns into blue colour. This indicates that the solution in test tube is
neutral
weak acid.
strong alkali.
weak alkali.
Which of the following produce the highest pH?
0.1 mol dm–3 hydrochloric acid.
0.1 mol dm–3 nitric acid.
0.1 mol dm–3 carbonic acid.
0.1 mol dm–3 sulphuric acid.
1.0 mol dm–3 aqueous sodium hydroxide has a higher pH value than 1.0 mol dm–3 aqueous ammonia because
sodium hydroxide is more soluble in water.
sodium hydroxide exists as molecules.
the molar mass of sodium hydroxide is higher.
sodium hydroxide dissociate completely in water to produce high concentration of hydroxide ions, OH-
What is the volume of distilled water needed to be added to 30 cm3 of 0.5 mol dm–3 hydrochloric acid to get a concentration of 0.1 mol dm–3 dilute hydrochloric acid?
80 cm3
100 cm3
120 cm3
150 cm3
3.7 g of calcium hydroxide, Ca(OH)2 is dissolved in water and diluted to 250 cm3 of solution. Calculate the molarity of hydroxide ions, OH– in the solution obtained.
[Relative atomic mass = H, 1; O, 16; Ca, 40]
0.1 M
0.2 M
0.3 M
0.4 M
Calculate the mass of nitric acid needed to prepare 150 cm3 of 0.5 mol dm–3 nitric acid solution.
[Relative atomic mass = H, 1; O, 16; N, 14]
2.325 g
3.575 g
5.625 g
4.725 g
Which of the following have the same pH value?
I 1.0 mol dm–3 HCl
II 1.0 mol dm–3 HNO3
III 1.0 mol dm–3 H2SO4
IV 1.0 mol dm–3 H3PO4
I and II
II and III
III and IV
I and IV
30 cm3 of distilled water was added to 20 cm3 of 0.2 mol dm–3 hydrochloric acid. What is the concentration, in mol dm–3, of hydrochloric acid produced?
0.04 mol dm–3
0.06 mol dm–3
0.08 mol dm–3
0.12 mol dm–3
25 cm3 of 0.5 mol dm–3 sodium hydroxide solution is titrated with 0.5 mol dm–3 sulphuric acid solution. What is the volume of sulphuric acid to complete the process?
7.5 cm3
12.5 cm3
20.0 cm3
32 .5 cm3
What is the colour of potassium hydroxide solution when added with a few drops of methyl orange solution?
Green
Blue
Pink
Yellow
