Chemistry, 24.07.2019 23:30 Satoetoe24

Which of the following solutions has the lowest boiling point? select one: a. 0.15 m nacl b. 0.10 m mgbr2 c. 0.15 m ba(no3)2 d. 0.20 m c2h6o2 e. 0.10 m fe(no3)3

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Answer from: tntaylor862

The solution with the lowest boiling point is: d. 0,20 $C_{2}H_{6}O_{2}$

Explanation:

The boiling point depends on the boiling point elevation which is a colligative property. All colligative properties depend on the concentration of particles (ions) present. So then, the concentration of particles for each point is determined by multiplying the molarity given by the Van’t Hoff factor. Each of these is calculated as follows:

a. 0,15M NaCl

1. The dissolution of sodium chloride can be represented by the following equation:

$NaCl(s)\rightarrow Na^{+}(ac)+Cl^{-}(ac)$ , so we have 2 particles (ions)

2. Replacing the value of 2 particles in the following formula:

$Concentration=(i)*(M)\\Concentration= (2)*(0,15)\\Concentration=0,30$

b. 0.10 M $MgBr_{2}$

1. The dissolution of Magnesium Bromide can be represented by the following equation:

<img src= " alt="MgBr_2\rightarrow Mg^{+2}(ac)+2Br^{-}(ac)" />" />, so we have 3 particles (ions)

2. Replacing the value of 3 particles in the following formula:

$Concentration=(i)*(M)\\Concentration= (3)*(0,10)\\Concentration=0,30$

c. 0,15 M $Ba(NO_{3})_{2}$

1. The dissolution of Barium Nitrate can be represented by the following equation:

$Ba(NO_{3})_{2}\rightarrow Ba^{+2}(ac)+2NO_3^{-1}(ac)$ , so we have 3 particles (ions)

2. Replacing the value of 3 particles in the following formula:

$Concentration=(i)*(M)\\Concentration= (3)*(0,15)\\Concentration=0,45$

d. 0.20M C_2H_6O_2 ;

Ethylene Glycol is a nonelectrolyte instead it is molecular compound. These compounds are formed by nonmetals, they can dissolve in water, but they don’t dissociate in the solution they stay intact, so then i=1 and the concentration of the particles is (0,20)(1)= 0,20.

e. 0.10M $Fe(NO_{3})_{3}$

1. The dissolution of Ferric Nitrate can be represented by the following equation

$Fe(NO_{3})_{3}\rightarrow Fe^{+3}(ac)+3NO_3^{-}(ac)$ , so we have 4 particles (ions),

2. Replacing the value of 4 particles in the following formula:

$Concentration=(i)*(M)\\Concentration= (4)*(0,10)\\Concentration=0,4$

Result: The solution 0.20M C_2H_6O_2 will have the lowest boiling point it has the lowest concentration of ions.

Answer from: Quest

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)

Answer from: Quest

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

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Which of the following solutions has the lowest boiling point? select one: a. 0.15 m nacl b. 0.10...

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