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rjkz [21]
3 years ago
13

If a solution conducts electricity, it is positive evidence that

Chemistry
1 answer:
BlackZzzverrR [31]3 years ago
3 0

Answer:

If a solution conducts electricity, it is positive evidence that solute dissolved in solvent is electrolyte.

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Determine the freezing point of an aqueous solution containing 10.50 g of magnesium bromide in 200.0 g of water.
Rudiy27
For an aqueous solution of MgBr2, a freezing point depression occurs due to the rules of colligative properties. Since MgBr2 is an ionic compound, it acts a strong electrolyte; thus, dissociating completely in an aqueous solution. For the equation:

                                ΔTf<span> = (K</span>f)(<span>m)(i)
</span>where: 
ΔTf = change in freezing point = (Ti - Tf)
Ti = freezing point of pure water = 0 celsius
Tf = freezing point of water with solute = ?
Kf = freezing point depression constant = 1.86 celsius-kg/mole (for water)
m = molality of solution (mol solute/kg solvent) = ?
i = ions in solution = 3

Computing for molality:
Molar mass of MgBr2 = 184.113 g/mol

m = 10.5g MgBr2 / 184.113/ 0.2 kg water = 0.285 mol/kg


For the problem, 
ΔTf = (Kf)(m)(i) = 1.86(0.285)(3) = 1.59 = Ti - Tf = 0 - Tf

Tf = -1.59 celsius
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3 years ago
Which of these statements are not true about a chemical reaction rate?
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A) Temperature does not affect reaction rate
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Can someone help me with problem 21.105? Many thanks!
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The correct answer is 1 to the 3rd power
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Express In scientific notation. Remember, M must be a number 1 SM &lt;10.<br> 18 =
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Read 2 more answers
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