What happens when dilute acids are added to metal carbonate powders or solutions?
Carbonates react with dilute acids to form bubbles of carbon dioxide.
How would you prove the identity of the compoundwhen dilute acids are added to metal carbonate powders or solutions
Carbon dioxide produces a white precipitate with limewater. This turns limewater milky.
How would you test for the presence of halide ions in solution?
Halide ions in solution produce precipitates with silver nitrate solution in the presence of dilute nitric acid.
How would you measure the volumes of a strong acid and alkali reacting together?
By titration. The alkali is pipetted into a conical flask. A suitable indicator is added. The acid is added carefully from a burette until the indicator shows that the solution is just neutralised.
If you know the concentration of the alkali, how would you find the concentration of the other reactant?
the results of a titration can be used to find the concentration of the other reactant.
When 25cm3 of 0.1mol dm-3 NaOH were titrated with 20cm3 of HCl. Find the concentration of the HCl.
HCl + NaOH → NaCl + H2O
Number of moles= 0.1x0.025 = 0.0025 moles of NaOH.
So 1:1 ratio of HCl:NaOH
So 0.0025 moles of HCl used
= 0.125 mol dm-3
If you had no indicator, what device could you use to measure the pH?
A pH meter or a pH sensor on a data-logger.