Concentration Calculations
20 past-paper questions on Concentration Calculations · examined 2020–2025.
20251 question
Use your answers to (c) and (d) to calculate the concentration of hydrogen ions, H+, in Y.
20232 questions
P is 1.25 mol / dm3 aqueous sodium hydroxide. Use your answer to (c) to calculate the concentration of sulfuric acid in Q. 2NaOH + H2SO4 → Na2SO4 + 2H2O
Use the mean volume of acid needed to neutralise 25.0 cm3 of A from (e) to calculate the concentration of ammonia in A. Give your answer to an appropriate number of significant figures.
20225 questions
Q is 0.275 mol / dm3 sodium carbonate. The ionic equation for the reaction is shown. CO32– + 2H+ H2O + CO2 Use your results from (a) to calculate the concentration, in mol / dm3, of hydrogen ions in P. Give your answer to three significant figures.
P is prepared by adding 5.0 cm3 of concentrated sulfuric acid to distilled water and making the total volume of the solution up to 250 cm3 with distilled water. Use your answer from (b) to calculate the number of moles of sulfuric acid in 5.0 cm3 of concentrated sulfuric acid.
Use your answer from (c) to calculate the concentration, in mol / dm3, of concentrated sulfuric acid.
Use your answer from (c) to calculate the concentration, in mol / dm3, of sulfuric acid in P.
P is a mixture of equal volumes of dilute hydrochloric acid, HCl, and dilute sulfuric acid, H2SO4. Calculate the concentration, in mol / dm3, of the dilute hydrochloric acid used to make P.
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