Question

Consider these compounds: A. Ag3PO4 B. Fe(OH) C. Fes D. Caso Complete the following statements by entering the letter(s) corresponding to the correct compound(s). (If more than one compound fits the description, include all the relevant compounds by writing your answer as a string of characters without punctuation, e.g, ABC.) and aluminum hydroxide Without doing any calculations it is possible to determine that aluminum hydroxide is more soluble than is less soluble than . It is not possible to determine whether aluminum hydroxide is more or less soluble than by simply comparing Kop values. Submit Answer Retry Entire Group 7 more group attempts remaining

Answer 1

To answer this question first tabulate the K_SP values of all the salts provided. I got this data from searching online for K_sp values of these salts.

Aluminium hydroxide	Al(OH)3	4 ions	3 x 10-34
Silver phosphate	Ag3PO4	4 ions	8.89 x 10-17
Ferric hydroxide	Fe(OH)3	4 ions	2.79 x 10-39
Ferrous sulfide	FeS	2 ions	8 x 10-19
Calcium sulfite	CaSO3	2ions	6.8 x 10-8

Few basis about K_sp values that are needed to answer the question given:

1. We can only directly compare salts that give equivalent numbers of ions.

2. For salts that produce the equivalent number of ions greater then K_sp value greater the solubility.

Based on the above information Al(OH)₃ , Ag₃PO_4, Fe(OH)₃ have same number of ions so their K_sp values can be compared.

So Aluminium hydroxide is more soluble than ferric hydroxide and less soluble than silver phosphate.

It is not possible to compare if aluminium hydroxide is less or more soluble than ferrous sulfide and calcium sulfite based on the K_sp values because the number of ions are not same for these species.

Hope this is clear, good luck.