The cancer drug cisplatin, Pt(NH₃)₂Cl₂, can be made by reacting (NH₄)₂PtCl₄ with ammonia in aqueous solution. Besides cisplatin, the other product is NH₄Cl.

(a) Write a balanced equation for this reaction.
(b) To obtain 12.50 g of cisplatin, what mass of (NH₄)₂PtCl₄ is required? What volume of 0.125 M NH₃ is required?

(c) Cisplatin can react with the organic compound pyridine, C₅H₅N, to form a new compound.

Suppose you treat 0.150 g of cisplatin with what you believe is an excess of liquid pyridine (1.50 mL; d = 0.979 g/mL). When the reaction is complete, you can find out how much pyridine was not used by titrating the solution with standardized HCl. If 37.0 mL of 0.475 M HCl is required to titrate the excess pyridine, what is the formula of the unknown compound Pt(NH₃)₂Cl₂(C₅H₅N)_x?

Transcribed Image Text:

Pt(NH3)₂Cl₂(aq) + x C5H5N(aq) → Pt(NH3)2Cl2(C5H5N)x(S)