The reaction between calcium carbonate and hydrochloric acid is shown by the equation below. CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)

Measuring the volume of gas produced against time can be used to calculate the rate of this reaction. Suggest one other way of measuring the rate of this reaction.

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.