Calcium carbonate is often used as an antacid. Your stomach acid is composed of HCl at a pH of 1.5. If you ate t much Turkey and need to neutralize 15.0 mL of stomach acid, how many grams of calcium carbonate would you need to take

0.0237 g of calcium carbonate would be required to neutralize the given amount of HCl

Explanation:

pH is defined as the negative logarithm of hydrogen ion concentration present in the solution

     .....(1)

Given value of pH = 1.5

Putting values in equation 1:

Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:

      .....(2)

We are given:

Volume of solution = 15.0 mL

Molarity of HCl = 0.0316 M

Putting values in equation 2:

The chemical equation for the reaction of HCl and calcium carbonate follows:

By the stoichiometry of the reaction:

2 moles of HCl reacts with 1 mole of calcium carbonate

So, of HCl will react with = of calcium carbonate

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

Moles of calcium carbonate =

Molar mass of calcium carbonate = 100.01 g/mol

Putting values in the above equation:

Hence, 0.0237 g of calcium carbonate would be required to neutralize the given amount of HCl