ours, not understanding that adding salt to your radiator will aid corrosion, sa

Question

ours, not understanding that adding salt to your radiator will aid corrosion, sa 1.1 l moles of NaCI instead, to improve the frezing point depression effect. Is this true? ow much more will the freczing point be lowered by adding 1.1 mol NaCI vs 1.1 mol ethylene glycol? For exampl glycol. eole. perhaps the freezing point would be lowered by a factor of i relative to etiylene 5) Calculate the moles of ions in the following solutions. An example has been provided: 1.0 L of 1.0 M Pb(NO: 1 mol of Pb ions, 2 mol of NO; ions a) 3.5 L. of 0.45 M Kl(aq) b) 8.76 L of 1.22 M Na SO (ag) )450 ml of o.98 M ethanol(ag) (ethanol is a non-electrolyte)

Explanation / Answer

5.

(a)

3.5 L of 0.45 M KI

Moles of KI = molarity * volume in L = 0.45 * 3.5 = 1.575 mol

KI (aq.) --------------> K+ (aq.) + I- (aq.)

So,

Moles of K+ = moles of I- = 1.575 mol

(b) 8.76 L of 1.22 M Na2SO4

Moles of Na2SO4 = 1.22 * 8.76 = 10.7 mol

Na2SO4 (aq.) ----------> 2 Na+ (aq.) + SO42- (aq.)

So,

Moles of SO42- = 10.7 mol

Moles of Na+ = 2 * 10.7 = 21.4 mol

(c)

Moles of ethanol = 0.98 * 0.450 = 0.441 mol

No ions are formed.

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