1. A sample of CaCO3 weighing 0.1234 g was dissolved in a 0.09967 M solution of hydrochloric acid, and 19.50 ml of a 0.1200 M NaOH solution was used to titrate the excess acid. The initial volume of HCl is (ml):
1) 40.00 2) 50.00; 3)48.24 4)50.24 5) 24.12.

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