Q1. A salt can be made by reacting an acid with an insoluble base,
A student has a sample of copper (II)oxide.
The student uses this method
Stage 1 pour 50 cm of dilute sulfuric acid into a beaker
Stage 2 warm the acid using a Bunsen bumer
Stage 3 add a small amount of copper (11) oxide to the warm acid and stir the mixture
Stage 4 add further amounts of copper (1) oxide until copper (II)oxide is in excess
Stage 5 filter the mixture
Stage 6 obtain crystals from the fitrate
(a) State why the acid is warmed in stage 2
(b) State how the student would know that the copper (II)oxide is in excess in stage 4
(c) State why the mixture is filtered in stage 5.
() State the color of the filtrate obtained in stage 5.
(Total for question 4 ma