Limestone consists mainly of the mineral calcite, CaCO3. The carbonate content of 0.5413 g of powdered limestone was measured by suspending the powder in water, adding 10.00 mL of 1.396 M HCl, and heating to dissolve the solid and expel CO2:                  CaCO3(s, 100.087 g/mol) + 2 H+ → Ca2+ + CO2(g) + H2O The excess acid required 39.96 mL of 0.1004 M NaOH for complete titration to a phenolphthalein end point. Find the weight percent of calcite in the limestone.

You are performing an experiment in lab that involves the titration of 25.0 mL of H2SO4 solution. You titrate the acidic solution with 0.8221 M NaOH and the equivalence point is reached by the addition of 16.25 mL of NaOH solution. Using the balanced equation below, calculate the Molarity of H2SO4 in the flask. Do NOT include units. 2NaOH(aq) + H2SO4(aq) → 2H2O(l) + Na2SO4(aq)

A chemist needs to determine the concentration of a solution of nitric acid, HNO3. She puts 905 mL of the acid in a flask along with a few drops of indicator. She then slowly adds 0.200 mol L Ba(OH)2 to the flask until the solution turns pink, indicating the equivalence point of the titration. She notes that 225 mL of Ba(OH)2 was needed to reach the equivalence point. Solution map In this titration, the concentration of base is known and can be used to calculate the unknown acid concentration: concentration of base → moles of base → moles of acid → concentration of acid Part A How many moles of Ba(OH)2 are present in 225 mL of 0.200 mol L-1 Ba(OH)2? Express your answer numerically in moles. • View Available Hint(s) Vo AEO ? mol Ba(OH)2 Submit

In an analysis of metal carbonate M2CO3∙3H2O, 1.500g of the unknown carbonate was dissolved in enough water to make a 100.0mL solution. 20.00mL of such solution was treated with 10.00mL of 1.000M HCl solution, and the excess acid was titrated with 54.92mL of 0.1138M NaOH solution. The equations are given below:     CO32-(aq) + 2 H+(aq) → H2O(l) + CO2(g)     H+(aq) + OH-(aq) → H2O(l)   a) the moles of NaOH used in the titration is (enter the answer in 4 sig. figs.) Answer       mol   b) the mole of HCl reacted with the carbonate is (enter the answer in 4 sig. figs.) Answer       mol   c) the molar mass of M2CO3∙3H2O is (enter the answer in 4 sig. figs.) Answer     g/mol   d) the identity of metal M is (enter the element symbol) Answer