Chemistry, 20.07.2019 20:50 joel53

The density of a 50% solution of naoh is 1.525 g/ml. what volume of a solution that is 50% by weight naoh is required to make 0.4 liter of 0.1m naoh solution?

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We consider that the 50% given in this item is by volume. Molarity is the unit of concentration that takes into account the number of moles of the solute and the number of moles of the substance.

number of moles of NaOH = (0.1 moles / L)(0.4 L)
n = 0.04 moles of NaOH

If we are to take the basis of 1 mL of 50% NaOH solution,

(1 mL solution)(1.525 g/mL)(0.50) = 0.7625 g
The number of moles is,
0.7625 g NaOH x (1 mol / 40 g) = 0.01906 moles of NaOH

volume of solution required = (0.04 moles of NaOH)(1 mL solution / 0.01906 moles of NaOH)

volume of solution required = 2.09 mL

2.09 mL

Answer from: kaieshaweston

The volume of NaOH required to make 0.4 L of 0.1 M solution is 2.09 ml.

Explanation:

Let us assume the 50% of the solution to be by volume.

Molarity of solution = 0.1 M

O.1 M solution means, 0.1 moles of solute in 1L of solution.

Moles of NaOH in 0.4 L solution = 0.1 $\times$ 0.4

Moles of NaOH = 0.04

Density = $\rm \frac{mass}{volume}$

Mass of 1 ml of 50% NaOH solution = $\rm Density\;\times\;Volume\;\times\;Dilution$

Mass of 1 ml 50% NaOH solution = 1.525 $\times$ 1 $\times\;\frac{50}{100}$

Mass of 1 ml of 50% NaOH solution = 0.7625 g

Moles of NaOH in 1 ml of 50% NaOH solution = $\rm \frac{0.7625}{40}$

Moles of NaOH in 1ml of 50% NaOH solution = 0.01906 moles/liters

Molarity = $\rm moles\;\times\;\frac{1000}{volume (ml)}$

Volume = $\rm moles\;\times\;\frac{1000}{Molarity}$

Volume of NaOH = $\rm 0.01906\;\times\;\frac{1000}{0.1}$ ml

Volume of NaOH = 2.09 ml

The volume of NaOH required to make 0.4 L of 0.1 M solution is 2.09 ml.

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Answer from: Quest

201cm/s÷5: 18

explanation:

there is no explanation

Answer from: Quest

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

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The density of a 50% solution of naoh is 1.525 g/ml. what volume of a solution that is 50% by weight...

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