All categories

2 years ago

How will adding NaCl affect the freezing point of a solution?

Chemistry

2 answers:

lord [1]2 years ago

3 0

Answer is: adding NaCl will lower the freezing point of a solution.

A solution (in this example solution of sodium chloride) freezes at a lower temperature than does the pure solvent (deionized water).

The higher the solute concentration (sodium chloride), freezing point depression of the solution will be greater.

Equation describing the change in freezing point:

ΔT = Kf · b · i.

ΔT - temperature change from pure solvent to solution.

Kf - the molal freezing point depression constant.

b - molality (moles of solute per kilogram of solvent).

i - Van’t Hoff Factor.

Dissociation of sodium chloride in water: NaCl(aq) → Na⁺(aq) + Cl⁻(aq).

valentinak56 [21]2 years ago

3 0

Adding NaCl (salt) will lower the freezing point. Examples of this include salt water bodies like the ocean, and why salt is spread on roadways during snow and icy conditions.

You might be interested in

Typical frequencies for several types of electromagnetic radiation are given below. Calculate the energy of each type of radiati

marusya05 [52]

Explanation:

The energy of electromagnetic radiation is given by :

$E=h\nu$

Where, h is the Planck's constant

(a) A gamma ray, $\nu = 1.64\times 10^{20}\ Hz$

Energy,

$E=6.63\times 10^{-34}\times 1.64\times 10^{20}\\E=1.08\times 10^{-13}\ J$

(b) A microwave, $\nu = 4.95\times 10^{10}\ Hz$

Energy,

$E=6.63\times 10^{-34}\times 4.95\times 10^{10}\\E=3.28\times 10^{-23}\ J$

Energy,

$E=6.63\times 10^{-34}\times 2\times 10^{6}\\E=1.32\times 10^{-27}\ J$

Therefore, this is the required solution.

4 0

2 years ago

Ways hydrogen can attain stability

NeTakaya

Hydrogen only has one electron in its lowest energy level. This is a very unstable arrangement, and hydrogen gas undergoes a variety of reactions so as to reach a stable electron configuration where its energy level is either empty of electrons, or filled with electrons.

7 0

2 years ago

What does an atomic number represent in an atom?

seraphim [82]

It represents the number of protons in the nucleus of an atom which determines the chemical properties of an element.

5 0

2 years ago

Read 2 more answers

Which are the intermolecular forces that can act between non-polar molecules?

Licemer1 [7]

The answer is london dispersion forces. It is one of two intermolecular forces that is present in all molecules!

8 0

2 years ago

The density of air under ordinary conditions at 25 degrees * C is 1.19g / L . How many kilograms of air are in a room that measu

professor190 [17]

Answer:

33.3 kg of air

Explanation:

This is a problem of conversion unit.

Density is mass / volume

Therefore we have to calculate the volume in the room, to be multiply by density. That answer will be the mass of air.

Volume of the room → 9 ft . 11 ft . 10 ft = 990 ft³

Density is in g/L, therefore we have to convert the ft³ to dm³ (1 dm³ = 1L)

990 ft³ . 28.3 dm³ / 1ft³ = 28017 dm³ → 28017 L

This is the volume of the room, if we replace it in the density formula we can know the mass of air in g.

1.19 g/L = Mass of air / 28017 L

Mass of air = 28017 L . 1.19 g/L → 33340 g of air

Finally, let's convert the mass in g to kg → 33340 g . 1kg / 1000 g = 33.3 kg

5 0

3 years ago