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3 years ago

What is an aqueous solution and what does it do?

Chemistry

1 answer:

7nadin3 [17]3 years ago

7 0

Answer:

An Aqueous solution is used to reference any solution where water acts as the solvent. A lot of substances can dissolve in water including acids and bases and when they do this they become aqueous solutions.

Aqueous solutions are denoted by the symbol (aq) in solutions as shown in this reaction below where Sodium Chloride is dissolved in water;

NaCl(s) → Na+(aq) + Cl-(aq)

Aqueous solutions are capable of conducting electricity if electrolytes are the ones dissolved in the water.

There are however some substances that cannot form aqueous solutions because they cannot dissolve well in water for example, organic substances like oils.

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Determine the freezing point of a solution that contains 78.8 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 7

slavikrds [6]

Answer:

0.74°C

Explanation:

The freezing point depression is a colligative property that can be calculated using the following expression.

ΔTf = Kf . b

where,

ΔTf: depression in the melting point

Kf: freezing point depression constant

b: molality

The mass of the solvent (benzene) is:

$722mL.\frac{0.877g}{mL} =633g=0.633kg$

The moles of solute (naphtalene) are:

$\frac{78.8g}{128.16g/mol} =0.615mol$

The molality of naphtalene is:

$b=\frac{0.615mol}{0.633kg} = 0.972mol/kg$

ΔTf = Kf . b

ΔTf = (4.90°C/m) . 0.972m = 4.76°C

The melting point of the solution is:

5.50°C - 4.76°C = 0.74°C

6 0

3 years ago

What are some non examples of acid.

Harlamova29_29 [7]

Answer:Tennis ball?

Explanation:

Well, an example would be DNA so a non-example could be a tennis ball. Or anything that isn't nucleic acids like lipids, perhaps.

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2 years ago

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4 years ago

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3 years ago