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2 years ago

6

Which has a lower freezing point ice or ice cream?

2 answers:

OverLord2011 [107]2 years ago

8 0

-0° freezing point ice or ice cream

Vladimir [108]2 years ago

4 0

Ice cream will have lower freezing point than ice. this can be understood with the concept of freezing point depression, which is a colligative property. Colligative properties are those which depends upon number of solvent/ solute particles. Ex: elevation in boiling point , osmotic pressure. If we add a nonvolatile solute in a solvent, its freezing point decreases. In case of ice cream we add sugar which lowers its freezing point, aa sugar is a non volatile solute.

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A chemist dissolves 248mg of pure hydrochloric acid in enough water to make up 140mL of solution.Calculate the pH of the solutio

evablogger [386]

Answer : The pH of the solution is, 1.31

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Mass of $HCl$ = 248 mg = 0.248 g (1 mg = 0.001 g)

Volume of solution = 140 mL

Molar mass of $HCl$ = 36.5 g/mole

First we have to calculate the concentration of hydrochloric acid.

Molarity : It is defined as the number of moles of solute present in one liter of volume of solution.

Formula used :

$\text{Molarity}=\frac{\text{Mass of }HCl\times 1000}{\text{Molar mass of }HCl\times \text{Volume of solution (in mL)}}$

Now put all the given values in this formula, we get:

$\text{Molarity}=\frac{0.248g\times 1000}{36.5g/mole\times 140mL}=0.0485mole/L=0.0485M$

The concentration of HCl is, 0.0485 M

As we know that, HCl dissociates to give hydrogen ion and chloride ion.

The dissociation reaction is:

$HCl\rightarrow H^++Cl^-$

Concentration of HCl = Concentration of H⁺ = Concentration of Cl⁻ = 0.0485 M

Now we have to calculate the pH of the solution.

pH : It is defined as the negative logarithm of hydrogen ion concentration.

Mathematically,

$pH=-\log [H^+]$

$pH=-\log (0.0485)$

$pH=1.31$

Therefore, the pH of the solution is, 1.31

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2 years ago