# 150140KI130120110100NaNO390807060NH CI"кCI-NaC50403020KCIO3Ce(SO0 10 20 30 40 50 60 70 80 90 100100Temperature (°C)Grams of solute/100 g H2ONH.

Question
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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?

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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.

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