This question is about acids and bases.
Give the chemical formula of the ion that is responsible for making an aqueous solution alkaline.
A student performs a titration using barium hydroxide solution and dilute hydrochloric acid.
The chemical equation for this neutralisation reaction is: Ba(OH)2(aq)+2HCl(aq)→BaCl2(aq)+2H2O(l)\text{Ba(OH)}_2(\text{aq}) + 2\text{HCl}(\text{aq}) \rightarrow \text{BaCl}_2(\text{aq}) + 2\text{H}_2\text{O}(\text{l})Ba(OH)2(aq)+2HCl(aq)→BaCl2(aq)+2H2O(l)
During the titration, 25.0 cm325.0\text{ cm}^325.0 cm3 of 0.120 mol/dm30.120\text{ mol/dm}^30.120 mol/dm3 barium hydroxide solution is completely neutralised by 22.4 cm322.4\text{ cm}^322.4 cm3 of hydrochloric acid.
Calculate the concentration of the hydrochloric acid in mol/dm3\text{mol/dm}^3mol/dm3. Give your final answer to 3 significant figures.
To find this, you should calculate:
Aqueous hydrochloric acid with a pH 2.5\text{pH } 2.5pH 2.5 has a hydrogen ion concentration of 3.16×10−3 mol/dm33.16 \times 10^{-3}\text{ mol/dm}^33.16×10−3 mol/dm3.
What is the concentration of H+\text{H}^+H+ ions in a solution of hydrochloric acid with pH 4.5\text{pH } 4.5pH 4.5?