Water freezes at a lower temperature when it contains solutes. To study the effe

Question

Water freezes at a lower temperature when it contains solutes. To study the effect of methanol on the freezing point of water, we might begin by preparing a series of solutions of known molalities. Calculate the number of grams of methanol (CH3OH) needed to prepare a series of solutions from 0.050 to 0.250 m in 0.050 m increments. For each solution use 200.0 g of water. Water freezes at a lower temperature when it contains solutes. To study the effect of methanol on the freezing point of water, we might begin by preparing a series of solutions of known molalities. Calculate the number of grams of methanol (CH3OH) needed to prepare a series of solutions from 0.050 to 0.250 m in 0.050 m increments. For each solution use 200.0 g of water.

Explanation / Answer

molaity = w/mwt*1000/W

1. 0.05 = (w/30)*(1000/200)

w = weight of methanol required = 0.3 grams

2.   0.1 = (w/30)*(1000/200)

w = weight of methanol required = 0.6 grams

3.

0.15 = (w/30)*(1000/200)

w = weight of methanol required = 0.9 grams

so that for every increment we have to add 0.3 grams methanol extra.

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