15)Imagine windowsill and a 7so ml. solution leave in the or the solvent solutio

Question

15)Imagine windowsill and a 7so ml. solution leave in the or the solvent solution of after evaporation? what uncowered on the the isthe 0.75 M s 16)The net ionic equation for the reaction of b. Cu 3 3NH4 copper(Ill) nitrate with (iq) uPO (aq) 3Nos (aq) CuPO (s) (s) 3 17)A student mhxed togethe iron (III) nitrate solutions: potassium carbonate, sodium hydroside, and a. No precipitate a tate observed and, if so, what was it? b. A would be A precipitate would be observed and would be sodium nitrate. e. A would be observed and it would be iron (Ill) carbonate. precipitate would be observed and it would be Aprecipitate would be and it would be a mix of iron om hydroxide and 18) Which of the following particle diagrams best represents an aqueous solution of KC? 19)You are given the following boiling-point data: 64.96 C. 78.5°C diethyl ether, ethylene glycol, Ho-CHz-CH2-0H 1980 C Which these liquids would you expect to have the highest vapor pressure atroom temperature? a. water, H20 b methanol, CH30H hanol, CH3 CH20H hyl ether, CH30Hz-0-CH20H3 ene glycol, HO-CH2-CH2-0H

Explanation / Answer

15) Moles of NaCl = (volume of solution in L)*(concentration in mol/L) = (750 mL)*(1 L/1000 mL)*(0.5 mol/L) = 0.375 mole.

The new volume of the solution is (750 – 150) mL = 600 mL = (600 mL)*(1 L/1000 mL) = 0.600 L.

New concentration of NaCl = (moles of NaCl)/(volume of solution in L) = (0.375 mole)/(0.600 L) = 0.625 mol/L 0.63 M (ans).

Ans: (C) 0.63 M

16) Copper (III) nitrate = Cu(NO3)3

Ammonium phosphate = (NH4)3PO4

This is a double displacement reaction where the anions change their positions. The products are:

Copper (III) phosphate = CuPO4

Ammonium nitrate = NH4NO3

All the species except copper (III) phosphate are in aqueous state and hence dissociate into ions. Copper (III) phosphate remains as solid.

Decompose the aqueous species into ions and write

Cu3+ (aq) + 3 NO3- (aq) + 3 NH4+ (aq) + PO43- (aq) --------> CuPO4 (s) + 3 NH4+ (aq) + 3 NO3- (aq)

Cancel out the common ions from both sides and write the net ionic equation as

Cu3+ (aq) + PO43- (aq) ---------> CuPO4 (s)

Ans: (b)

17) The sodium, potassium and nitrate salts are water soluble. Iron (III) hydroxide and iron (III) carbonate are both insoluble in water. Hence option (e) is the correct answer.

Ans: (e)

18) KCl is a 1:1 electrolyte which means that 1 mole of KCl furnishes 1 mole of potassium ions and 1 mole of chloride ions. The second picture depicts equal number of ions and is the correct answer.

Ans: (b)

19) The vapor pressure of a substance depends on the intermolecular forces present in the substance. If a molecule has weak intermolecular forces like dipole-dipole forces and London dispersion forces, then the vapor pressure of the molecule will be high. All the substances except diethyl ether show strong intermolecular forces like hydrogen bonding. Hence, diethyl ether will have the highest vapor pressure.

Ans: (d)

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