Use the table of standard reduction potentials for the following exercises. Pred

Question

Use the table of standard reduction potentials for the following exercises. Predict if the following will occur under standard conditions, if so, write the products with correct phases: HCl (aq) + Au (s) HCl (aq) + Na (s) Au^3+ (aq) + Na (s) Find a reagent that can oxidize Br^-1 to Br2 but cannot oxidize Cl^-1 to CI2. Assuming standard conditions, indicate which of the following is true: H2 (g) can reduce Ag^+(aq). H2 (g) can reduce Ni^+2 (aq). Fe^2+ (aq) can reduce Cu^2+ (aq). H^+ (aq) can oxidize Mg(s). Pb^2+(aq) can oxidize Ni(s).

Explanation / Answer

Ans 4

The metals which have standard reduction potential less than hydrogen , can displace it from the acid.

A) Au has higher reduction potential than hydrogen hence it will not react with HCl.

B) 2HCl + 2Na ---> NaCl + H2

Sodium has negative standard reduction potential so it will replace hydrogen from HCl , it reacts vigorously to form NaCl.

C) Au3+ + 3Na ---> 3Na+ + Au

Sodium has less standard reduction potential than Gold , hence it will reduce it and get itself oxidised.

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