List the following solutions in order of decreasing freezing point: I. 0.040 mol kg−1 glycerin (a nonelectrolyte) II. 0.025 mol kg−1 Na2SO4 (assume complete dissociation in aqueous solution) III. 0.030 mol kg−1 KBr (assume complete dissociation in aqueous solution)
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Ответ:
0.040 mol glycerin > 0.030 mol KBr> 0.025 mol![Na2SO_4](/tpl/images/0561/2772/4a2ad.png)
Explanation:
Depression in freezing point:
where,
m = molality
1. For 0.040 mol glycerin
, i= 1 as it is a non electrolyte and does not dissociate, concentration of ions will be![1\times 0.040=0.040](/tpl/images/0561/2772/01cce.png)
2. For 0.025 mol![Na2SO_4](/tpl/images/0561/2772/4a2ad.png)
, i= 3 as it is a electrolyte and dissociate to give 3 ions. and concentration of ions will be
3. For 0.030 mol KBr
, i= 2 as it is a electrolyte and dissociate to give 2 ions, concentration of ions will be![2\times 0.030=0.060](/tpl/images/0561/2772/ad298.png)
Thus as concentration of solute is highest for
, the depression in freezing point will be highest and thus freezing point will be lowest.
The order of decreasing freezing point: 0.040 mol glycerin > 0.030 mol KBr> 0.025 mol![Na2SO_4](/tpl/images/0561/2772/4a2ad.png)
Ответ:
Type of Chemical Reaction: For this reaction we have a single displacement reaction. Balancing Strategies: Note that this is the chemical reaction that takes place when diluted Sulfuric acid reacts with iron.
Explanation: