In Experiment II, 20 cm3 of 0.1 mol/dm3 hydrochloric acid is reacted with excess calcium carbonate. Suggest the concentration of hydrochloric used if the same volume was used for Experiment III.

5.0 cm3 of 0.050 mol/dm3 sodium carbonate was completely neutralised by 20.00 cm3 of dilute hydrochloric acid. Calculate the concentration in mol/dm3 of the hydrochloric acid.

A 30.0 cm3 sample of a gastric juice was neutralised using solid Mg(OH)2(s). The mass of the Mg(OH)2(s) was 0.341 g. What was the concentration of hydrochloric acid, in mol dm–3, in this sample of the gastric juice?State your answer to three significant figures and units are not required. M  Mg(OH)2 = 58.32 g mol–1.Answer:   mol dm–3

A dilute solution of sodium chloride was prepared with a concentration of 50.0 ppm. Convert this concentration to a molar concentration in mol dm−3.

10 A large excess of marble chips is reacted with 25 cm 3 of 1.0 mol dm –3 hydrochloric acid at 40 C.How is the result different when the reaction is repeated with 60 cm 3 of 0.5 mol dm –3 hydrochloricacid at 40 C?A The reaction is faster and more of the products are made when the reaction is complete.B The reaction is faster and less of the products are made when the reaction is complete.C The reaction is slower and more of the products are made when the reaction is complete.D The reaction is slower and less of the products are made when the reaction is complete.

Calculate the amount (in mol) of hydrochloric acid, HCl (aq), in 50.0 cm3 of a 2.00 mol dm–3 solution of HCl.