Question

6. (six marks) A saturated solution of KCIO3 is cooled from 50°C to 5°C when it is placed into a fridge. Calculate how much potassium chlorate will crystallize from a 1.0-L solution.

Answer 1

for the Value of solubility of kclo3 in water please see the solubility curve.that are different for different temperature.

ANSWER 8 To find out how much salt precipitates with cooling of the solution, we need to find ott the solubiuties of salt in w ater at the given two temperature.. we can use the solubility curve for this I purpose. - 18.5 gm solubility Scooc ñ 100 me Ho solubilley S5°C = 400 ml to | Now we can find the mass of solute in 1 L of solvent at each temperature. (1000 ml (mass) M55°c = ssocx 1000 ml = 185 gm (mass) moor = sec x 1000 ml = 45 qm difference = M55%-mg = 185 - $450 - 140 gm That amount will crystallize from 14 (1000me) sol,

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ANSKER & In order to dilute an acid, 01. First you have to decide the concentration of desired (M2) and of cource you have to know the concentration of the original acid solution that you want to dilute (Mi). In addition you have to decide the volume of interest of diluted solution you gonna get. Make sure that a M, and My are given in the same unit for example both of them in molarity (M). U After you get these values you have to use this formula T ita + Mix = M2 V2 DH Using this formula you can get value Of Vio Now you know how much volume you need! it to take from original solution. In order to know how much water you should add to v calculate it by ( v v ) the result is the Lamo unt of water you have to add.