CH-2005

Empirical and molecular formulae

Chemistry · Secondary 4 · Hard · Empirical and molecular formulae

A student dissolves 14.3 g of

\text{Na}_2\text{CO}_3 \cdot x\text{H}_2\text{O}

in water and makes up the solution to 250 cm³. Titration shows that the concentration of

\text{Na}_2\text{CO}_3

is 0.400 mol/dm³. What is the value of

x

[M_r(\text{Na}_2\text{CO}_3) = 106,\ M_r(\text{H}_2\text{O}) = 18]

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