10-minute Quiz : Chapter 15 Concentration of solutions

6.05 g of magnesium sulphate solid is dissolved in water and made up to a 250.0 cm³ solution. What is the molarity of the solution?

(Relative atomic masses: H = 1.0, O = 16.0, Mg = 24.3, S = 32.1)

• A. 0.100 mol dm⁻³

• B. 0.201 mol dm⁻³

• C. 1.26 mol dm⁻³

• D. 1.52 mol dm⁻³

Tags

NGSS.HS-PS1-7

A 0.50 M aluminium sulphate solution is prepared by dissolving 17.1 g of aluminium sulphate powder completely in water. What is the volume of this solution?

(Relative atomic masses: O = 16.0, Al = 27.0, S = 32.1)

• A. 100 cm³

• B. 150 cm³

• C. 200 cm³

• D. 500 cm³

Which of the following solutions contain the same number of ions?

(1) 15 cm³ of 0.8 mol dm⁻³ sodium carbonate solution

(2) 12 cm³ of 1.0 mol dm⁻³ ammonium sulphate solution

(3) 10 cm³ of 1.8 mol dm⁻³ ammonium nitrate solution

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

The normal fasting blood glucose concentration ranges from 3.9 × 10⁻³ mol dm⁻³ to 5.6 × 10⁻³ mol dm⁻³. Which of the following masses of glucose gives a concentration within this range when dissolved in 1.0 dm³ of blood?

(Molar mass of glucose = 180 g mol⁻¹)

• A. 0.090 g

• B. 0.18 g

• C. 0.90 g

• D. 9.0 g

Which of the following solutions just completely reacts with 20 cm³ of 0.05 M hydrochloric acid?

2HCl(aq) + Na₂CO₃(aq) → 2NaCl(aq) + CO₂(g) + H₂O(ℓ)

• A. 10 cm³ of 0.05 M sodium carbonate solution

• B. 10 cm³ of 0.10 M sodium carbonate solution

• C. 40 cm³ of 0.05 M sodium carbonate solution

• D. 40 cm³ of 0.10 M sodium carbonate solution

Tags

NGSS.HS-PS1-7

What is the mass of calcium hydroxide in 100 cm³ of 0.100 M calcium hydroxide solution?

(Relative atomic masses: H = 1.0, O = 16.0, Ca = 40.1)

• A. 0.571 g

• B. 0.741 g

• C. 1.31 g

• D. 1.48 g

Tags

NGSS.HS-PS1-7

How many moles of ions are present in 20.0 cm³ of 0.050 mol dm⁻³ calcium chloride solution?

• A. 0.0010 mol

• B. 0.0020 mol

• C. 0.0030 mol

• D. 0.0050 mol

5.50 g of hydrated calcium chloride (CaCl₂ • nH₂O) is dissolved in water and made up to a 200.0 cm³ solution. The molarity of the solution is 0.15 M. What is the value of n?

(Relative atomic masses: H = 1.0, O = 16.0, Cl = 35.5, Ca = 40.1)

• A. 1

• B. 2

• C. 3

• D. 4

Tags

NGSS.HS-PS1-7

150.0 cm³ of 0.2 M KOH(aq) is mixed with 350.0 cm³ of 0.8 M KOH(aq). What is the concentration of KOH(aq) in the resultant solution?

• A. 0.50 M

• B. 0.62 M

• C. 0.89 M

• D. 2.1 M

Tags

NGSS.HS-PS1-7

What volume of water is needed to dilute 120 cm³ of 10 M sulphuric acid to a solution of 2.0 M?

• A. 360 cm³

• B. 480 cm³

• C. 600 cm³

• D. 720 cm³