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maraa013001
maraa013001
23.04.2021 • 
Chemistry

1. An aqueous solution of 2.0 dm³ contains 53.0 g sodium trioxocarbonate Calculate the
Concentration in
(i) g dm3
(ii) mold m-3
[NazCO3=106)

2. Calculate the mass of quicklime produced when 10 g of limestone is heated.
[Ca=40; C=12; O=16]

The equation for the reaction is: CaCO3 → CaO + CO2

3. A 0.04g of copper metal reacts completely with 25 cm³ of 0.5 mol d/m³ H2SO4

(i) Write a balance chemical equation for the reaction.

(ii) Calculate the molar mass of the copper metal.

4. A standard solution of sodium hydroxide was prepared by dissolving 4g of the
solute in 250 cm³ of water.

(i) Determine the molarity of the solution.

(ii) Calculate the volume of the water required to dilute 100 cm³ of the solution to
a concentration of
0.25 mol dm. [Na=23; O=16; H=1].

5. Calculate the volume of water needed to dilute 20 cm³ of 5.0 M HCL to 1.0 M HCL
solution.​

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