Washing soda has the formula Na₂CO₃.10H₂O. What mass of anhydrous sodium carbonate is left when all the water of crystallization is expelled by heating 57.2 g of washing soda?

Q.

Washing soda has the formula $N{a}_{2}C{O}_3.10H_{2}O.$ What mass of anhydrous sodium carbonate is left when all the water of crystallization is expelled by heating 57.2 g of washing soda?

Q.

(a) If 112 cm³ of hydrogen sulphide is mixed with 120 cm³ of chlorine at STP, what is the mass of sulphur formed?
H₂S + Cl₂ $\stackrel{}{\to }$ 2HCl + S
(b) Washing soda has the formula Na₂CO₃·10H₂O. What is the mass of anhydrous sodium carbonate left when all the water of crystallization is expelled by heating 57.2 g of washing soda?
(c) When excess lead nitrate solution was added to a solution of sodium sulphate, 15.1 g of lead sulphate was precipitated. What mass of sodium sulphate was present in the original solution?
Na₂SO₄ + Pb(NO₃)₂ $\stackrel{}{\to }$ PbSO₄ + 2NaNO₃
(H = 1; C = 12; O = 16; Na = 23; S = 32; Pb = 207)

Q. A box of washing soda has 1.50 kg of $N{a}_{2}C{O}_3.10H_{2}O$ (molar mass = 286 g/mol). The box was sent to the godown and it weighed only 1.34 kg on arrival. An independent analyst says that the box contains the correct mass of sodium carbonate, but that it has lost the water of crystallization. What is the composition of the washing soda received by the godown?

Q. The common name of sodium carbonate ($N{a}_{2}C{O}_3$) is washing soda.

Q. Heating sodium carbonate produces washing soda.