A solution contains a mixture of Na2CO3
and NaOH. Using phenolphthalein indicator 25 mL of mixture required
19.5 mL of 0.995 M HCl for the endpoint. With methyl orange, 25 mL
of solution required 25 mL of the same HCl for the endpoint.
Calculate grams per liter of Na2CO3 in the
mixture.
a. 36
b. 15
c. 23
d. 78