1- what is the percentage of sodium carbonate in a sample of 0.3215 g. If 27.92 ml of 0.1131 M HCl were needed to titrate the sample
2- A 1.5 g of soda ash sample was dissolved in 250 mL water. Titration of 10 mL of the solution required 4 mL of 0.2 M HCl. What is the percent purity of soda ash ?
Could anybody help me ?