Ammonia. NH_3, is very soluble in water (51.8 g/L at 20 degree C and 760 mmHg).

Question

Ammonia. NH_3, is very soluble in water (51.8 g/L at 20 degree C and 760 mmHg). What is the solubility of ammonia in water in moles per liter? a. 14.67 M b. 51.8 M c. 3.05 M d. 0.0682 M Which of the following would you expect to be a Broasted-Lowry base? a. HNO_2 b. NH_4^- c. Ni^2+ d. PO_4^3- Which one of the following is a triprotic acid? a. acetic acid b. hydrochloric acid c. phosphoric acid d. sulfuric acid Which is an amphoteric species? a. SO_4^2- b. H_2 SO_4 c. HSO_4^- d. H_3 O^+ Considering 1.0 M solutions of each substance, which contains the largest concentration of ions? a. K_2 SO_4 b. FeCl_3 c. NaOH d. NH_3 Which substance is not an electrolyte? a. sodium chloride b. hydrochloric acid c. ammonium nitrate d. urea What is the osmolarity of a 0.20 M solution of K_2 PO_4? a. 0.200 smol b. 0.40 Osmol c. 0.60 Osmol d. 0.80 Osmol A substance which completely dissociates in solution, providing a large number of ions to conduct electricity a. is isotonic b. a weak electrolyte c. a non-electrolyte d. a strong electrolyte

Explanation / Answer

20 -----(d)

Bronsted base is proton acceptor, hence PO43- has ability to accept a proton.

21-----(c)

Phosphoric acid (H3PO4) has three protons hence it dontes 3 hydrogen hence it is triprotic acid.

22----(c) HSO4-

HSO4- has an ability to donate proton as well as ability to accept proton hence it is amphoprotic species.

23-----(b) FeCl3

Ionization of FeCl3 produces 3 mol of Cl- ions hence it will produce highest concentration of ions.

26----(d)

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