Question

The concentration of phosphoric acid (H_3PO_4) in Coca-Cola is 164. mg/L.

Is one Tums tablet capable of neutralizing the acid in a 355. ml can of Coke?

1 Tums tablet = 1.308 grams

1 Tums tablet = 500. mg of CaCO_3 per tablet

Answer 1

concentration of H3PO4 = 164 mg / L = 164 x 10^-3 g / L

mass of H3PO4 = 0.164 g

moles of H3PO4 = mass / molar mass = 0.164 / 98 = 1.67 x 10^-3

Molarity = 0.00167 M

in 355 mL the moles = molarity x volume

                               = 1.67 x 10^-3 x 0.355

                              = 5.93 x 10^-4 moles H3PO4

1 tums tablet = 500 mg of CaCO3 per tablet  

(CaCO3 molar mass = 100 g/mol)

1 tums of tablet has = 0.5 / 100 = 0.005 moles of CaCO3

0.005 moles are greater than 5.93 x 10^-4 moles of H3PO4. so

1 Tums tablet capable of neutralizing the acid in a 355. ml can of Coke