Potassium permanganate(KMNO4)is has a solubility of 6.4 g/ 100 g of water at 20ºC, and 250 g / Literof water at 65ºC(Use 1.00 g/mL as the density of water)
a)Can you dissolve more or less potassium permanganateby increasing the temperature of the solution? Clearly show your calculations or reasoning.
b)What mass of potassium permanganatecan dissolve in 65 g of water at 20ºC?
c)What mass of potassium permanganate will precipitate out of a solution made by dissolving 21.3 g of potassium permanganate in 65 g of water at 65ºC and then cooling the solution down to 20ºC?
b)
At 20 deg C,
Mass of KMnO4 dissolve in 100 g water = 6.4 g
Mass of KMnO4 dissolve in 65 g water = ( 6.4 x 65 ) / 100
Mass of KMnO4 dissolve in 65 g water = 4.16 g
c)
At 65 deg C,
Mass of KMnO4 dissolve in 1000 g water = 250 g
Mass of KMnO4 dissolve in 65 g water = ( 250 x 65 ) / 1000
Mass of KMnO4 dissolve in 65 g water = 16.25 g
Mass of KMnO4 left = 21.3 - 16.25 = 5.05 g
Mass of KMnO4 dissolve in 65 g water at 20 deg C = 4.16 g
Mass of KMnO4 left at 20 deg C = 5.05 - 4.16 = 0.89 g
Potassium permanganate(KMNO4)is has a solubility of 6.4 g/ 100 g of water at 20ºC, and 250...
How many grams of potassium permanganate (KMnO4) are required to prepare a 250-mL solution whose concentration is 2.16 M?
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6.4 g of potassium hydroxide (56.1 g/mol) dissolves in 105 g of
water. The temperature of the solution increases by 13.97
oC. Calculate the ΔHsoln in kJ/mol
for potassium hydroxide (the specific heat capacity of the solution
is 4.2 J g-1oC-1).
KOH(s)
K+(aq) + OH-(aq)
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