Results table Concentration / Tube Contents Calculated pH Measured pH mol dm–3 Hydrochloric acid 0.1 1 Hydrochloric acid 0.01 2 Hydrochloric acid 0.001 3 Sodium hydroxide 0.05 4 Sodium hydroxide 0.005 5 Sodium hydroxide 0.0005 6 Ethanoic acid 0.1 7 Ethanoic acid 0.01 8 Ethanoic acid 0.001 9 Hydrochloric acid 2+5 Ethanoic acid + sodium ethanoate 7+4 Drops of 0.05 mol dm–3 sodium hydroxide needed to raise pH above 7 Tube 7+4 3
Results table Tube Contents Concentration / mol dm–3 Calculated pH Measured pH 1 Hydrochloric acid 0.1 2 Hydrochloric acid 0.01 3 Hydrochloric acid 0.001 4 Sodium hydroxide 0.05 5 Sodium hydroxide 0.005 6 Sodium hydroxide 0.0005 7 Ethanoic acid 0.1 8 Ethanoic acid 0.01 9 Ethanoic acid 0.001 2+5 Hydrochloric acid 7+4 Ethanoic acid + sodium ethanoate Tube Drops of 0.05 mol dm–3 sodium hydroxide needed to raise pH above 7 7+4 3
250294-measuring-the-ph-of-solutions-activity.docx