Question
Asked Nov 15, 2019
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Using the attached solubility curve, please answer the following

  1. At 50 C, which solute is least soluble: KCl, KClO3, NH3 or NH4Cl?
  2. If 65 g of NH4Cl are added to 100 g of water at 50 °C, how many grams of NH4Cl will not dissolve?

 

150
140
KI
130
120
110
100
NaNO3
90
80
70
60
NH CI
"кCI-
NaC
50
40
30
20
KCIO3
Ce(SO
0 10 20 30 40 50 60 70 80 90 100
10
0
Temperature (°C)
Grams of solute/100 g H2O
NH.
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150 140 KI 130 120 110 100 NaNO3 90 80 70 60 NH CI "кCI- NaC 50 40 30 20 KCIO3 Ce(SO 0 10 20 30 40 50 60 70 80 90 100 10 0 Temperature (°C) Grams of solute/100 g H2O NH.

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Expert Answer

Step 1

The term solubility for a given substance can be defined as the ability of a given substance to get dissolved in the given amount of the solvent. It can also be measured in terms of the maximum amount of the given solute that can be dissolved in the solvent at equilibrium. The solution so formed is called as a saturated solution.

Step 2

From the given solubility curve of various compounds, the compound which is least soluble at 50o C can be determined by estimating the amount of the substance which is the least. This means that the compound whose least amount has been dissolved in the given amount of the solvent, will be the least soluble compound.  

Step 3

According the graph at 50oC, the least amount of salt which has been dissolved in the solvent is that of KClO3.

From ...

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KC-43 g KCIO, 20 g NH 52g NH C 50 g

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