Question

Which two aqueous solutions, when mixed together, do not produce a white precipitate?
A. Silver nitrate and sodium chloride

B. Magnesium nitrate and sodium sulphate
C. Barium nitrate and sodium sulphate

D. Zinc nitrate and sodium carbonate

Answer 1

Which two aqueous solutions, when mixed together, do not produce a white precipitate?

A. Silver nitrate and sodium chloride

B. Magnesium nitrate and sodium sulphate

C. Barium nitrate and sodium sulphate

D. Zinc nitrate and sodium carbonate

$$\mathrm{AgNO_3} + \mathrm{NaCl} \rightarrow \mathrm{NaNO_3} + \underline{\mathrm{AgCl}}$$ $$2\mathrm{MgNO_3} + \mathrm{Na_2SO_4} \rightarrow -$$ $$2\mathrm{BaNO_3} + \mathrm{Na_2SO_4} \rightarrow 2\mathrm{NaNO_3} + \underline{\mathrm{BaSO_4}}$$ $$2\mathrm{ZnNO_3} + \mathrm{Na_2CO_3} \rightarrow 2\mathrm{NaNO_3} + \underline{\mathrm{ZnCO_3}}$$

Answer: B