d) A student investigated the electrolysis of two aqueous salt solutions. Hydrogen is produced at the negative electrode when the metal in the salt solution is more reactive than hydrogen. Complete Table 2 to show what the student would observe at the negative electrode for each salt solution. Table 2 Salt solution & Observation at negative electrode }(l) Copper sulfate & Sodium chloride &

## Step 1:The question is about the electrolysis of an aqueous salt solution, specifically copper sulfate. Electrolysis is a process that uses an electric current to drive a non-spontaneous chemical reaction. In this case, the salt solution is copper sulfate, which is an ionic compound and will dissociate into its constituent ions in an aqueous solution.## Step 2:The negative electrode in electrolysis is known as the cathode. During electrolysis, cations (positively charged ions) move towards the cathode. In the case of copper sulfate, the cations are copper ions (Cu2+) and hydrogen ions (H+), the latter being contributed by water.## Step 3:The question mentions that hydrogen is produced at the cathode when the metal in the salt solution is more reactive than hydrogen. In the reactivity series, copper is less reactive than hydrogen. This means that the copper ions (Cu2+) will be discharged at the cathode instead of the hydrogen ions (H+).### The formula for the reaction at the cathode is: ### ## Step 4:The result of this reaction is the deposition of copper metal at the cathode. Therefore, the observation at the negative electrode (cathode) when electrolyzing a copper sulfate solution would be the appearance of copper metal.