1. The active catalyst in this experiment was generated from the redox reaction

Question

1. The active catalyst in this experiment was generated from the redox reaction of chloroplatinic acid with sodium borohydride. Please review redox reactions and oxidation number assignments from your general chemistry textbook. H2PtCl6 + 2NaBH4 + 6H2O Pt + B(OH)3 + H2 + HCl + NaCl

a) Using the given reactant coefficients, balance the redox reaction shown above by adding the appropriate product coefficients.

b) What is the active catalyst?

c) Circle and label the atom in the starting materials that is reduced (Hint: assign oxidation numbers, starting with atoms that are familiar to you from general chemistry).

d) Circle and label the atoms in the starting materials that are oxidized.

Explanation / Answer

(A)

H2PtCl6 + 2NaBH4 + 6H2O -------> Pt + 2 B(OH)3 + 9 H2 + 4HCl + 2 NaCl

+1+4-1       +1+3-1   +1-2              0           +3-2-1     0             +1-1      +1-1

(b) Platinum

(c) Pt is reduced from +4 state to 0

(d) H of NaBH4 is oxidised from -1 to 0

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