Some cooks add salt to a kettle of
water in which they are boiling peeled corn or unpeeled potatoes.
In addition to improving the flavor, this practice is reputed to
cook and soften the food better.
–Is there any scientific justification for this? Explain.
– What is the concentration of NaCl in grams of salt per
kilogram of water needed to obtain a significant rise in the
boiling point, say 5◦C?
–Would this concentration of NaCl render the food too...
What is the equilibrium concentration of Ni^2+ (aq) in the
solution. If one millimole of Ni(NO3)2 dissolves in 220.0 mL of a
solution that is 0.300 M in ammonia?
The boiling point constant for water is 0.51 Kkg/mol. Calculate
boiling point of water in a solution gf 0.010 mol/kg of sugar and a
solution of 0.010 mol/kg of NaCl.
Rank these aqueous solutions from highest boiling point to
lowest boiling point.
1 = highest boiling point; 4 = lowest boiling point
0.40 m C2H6O2
0.20 m Na3PO4
0.30 m KNO3
0.20 m C6H12O6
One millimole of Ni(NO3)2 dissolves in 210mL of a solution that
is .500M in NH3.
(a) What is the initial concentration of Ni(NO3)2 in the
solution?
------> The answer to (a) is .00476 M. I just can't figure
out part (b)
(b) What is the equilibrium concentration of Ni^2+(aq) in the
solution?
HINT: The Ni^2+ forms a hexammonia complex: Ni(NH3)6^2+. Kf =
5.5 x 10^8.
Colligative properties (boiling point increase)
a. Order the following solutions in ascending order of their
boiling point: 0.0825 m NaCl, 0.050 m KCl, 0.050 M Na2SO4, 0.055m
Ca (NO3) 2, 0.050 m Na3PO4.
If the boiling point of a 0.100 m NaCl aqueous solution is 100.5
◦C, answer…
b. How much will the boiling point of a 0.0825 m KCl solution
be?
c. How much will be the boiling point of a solution 0.0825 m Ca
(NO3) 2?
d. Determine...
One millimole of Ni(NO3)2 dissolves in 260.0 mL of a solution
that is 0.400 M in ammonia.
The formation constant of Ni(NH3)62+ is 5.5×10^8.
What is the equilibrium concentration of Ni2+(aq ) in
the solution?
One millimole of Ni(NO3)2 dissolves in 210.0 mL of a solution
that is 0.500 M in ammonia.
The formation constant of Ni(NH3)62+ is 5.5×108.
What is the equilibrium concentration of Ni2+(aq ) in
the solution?
(A) A current of 4.62 A is passed through a Ni(NO3)2 solution
for 1.70 hours. How much nickel is plated out of the solution?
(B) A current of 4.09 A is passed through a Cr(NO3)2 solution.
How long (in hours) would this current have to be applied to plate
out 7.70 g of chromium?
A solution is prepared in which 0.00100 mol of Ni(NO3)2 and
0.500 mole of NH3 are dissolved in a total volume of 1.00 L. What
is the concentration of Ni(H2O)62+ ions in the solution at
equilibrium?