For carrying out titration, a burette and pipette are used rather than measuring cylinder. Why ?

 

Choose two starting compounds you could use to make this insoluble salt Calcium sulphate.

Balance the following equations:

a) ${\mathrm{CaCl}}_2\left(\mathrm{aq}\right)+ {\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)\to {\mathrm{CaSO}}_4\left(\mathrm{s}\right)\downarrow + \mathrm{NaCl}\left(\mathrm{aq}\right)$.

b) ${\mathrm{MgCl}}_2\left(\mathrm{aq}\right) + {\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{aq}\right) \to {\mathrm{MgCO}}_3\left(\mathrm{s}\right)\downarrow +\mathrm{NaCl} \left(\mathrm{aq}\right)$.

c) ${\mathrm{ZnCl}}_2 + {\mathrm{Na}}_2{\mathrm{CO}}_3\to {\mathrm{ZnCO}}_3\downarrow + \mathrm{NaCl}$.

d) ${\mathrm{PbNO}}_3 + \mathrm{NaCl} \to {\mathrm{PbCl}}_2\downarrow + {\mathrm{NaNO}}_3$.