In some areas of the United States, the water supply contains a significant conc

Question

In some areas of the United States, the water supply contains a significant concentration of MgCO3. This is called "hard" water, and can leave behind solid deposits of MgCO3 on cookware, shower heads, and sinks. Below are some possible home remedies to remove hard water stains. Circle the best option, and explain why it would remove the solid MgCO3 (please explain clearly)

a) Soaking the stains in pure distilled water

b) Soaking the stains in vinegar (acetic acid, HC2H3O2)

c) Scrubbing with a paste made of baking soda (sodium bicarbonate, NaHCO3)

d) Using soap and hot water (typical soap molecule)

Explanation / Answer

answer is b) soaking the stains in vinegar it remove magnesium carbonate by forming magnesium acetate

MgCO3 + CH3COOH ---------------> Mg2+(CH3COO-)2 (aq) + CO2 + H2O

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