Question

A 2.0% (m/v) nacl solution contains ________ g nacl in 300. ml of solution.

Answer 1

when composition is given as m/v % , the value is the mass of the solute in 100 mL of the solution

this means there is 2.0 g in 100 mL of the solution

therefore if 100 mL of solution contains - 2.0 g

then 300 mL of the solution would contain - 2.0 g / 100 mL x 300 mL = 6.0 g

there's a mass of 6.0 g of NaCl in 300 mL of the soltuion

Answer 2

300 mL of NaCl solution contains $\boxed{{\text{6 g}}}$ NaCl.

Further Explanation:

The concentration is the proportion of substance in the mixture. The most commonly used concentration terms are as follows:

1. Molarity (M)

2. Molality (m)

3. Mole fraction (X)

4. Parts per million (ppm)

5. Mass percent ((w/w)%)

6. Volume percent ((v/v)%)

7. Mass per volume percent ((w/v)%)

Mass per volume percent is defined as the amount of solute dissolved in a given volume of the solvent, multiplied by 100 %.

The formula to calculate the mass per volume percent of the solution is as follows:

${\text{Mass per volume}}\left({{\text{m/v}}}\right){\text{\%}}=\left({\frac{{{\text{Mass (g) of solute}}}}{{{\text{Volume (mL) of solution}}}}}\right)\times\left({100\;\%}\right)$

Given information:

A 2.0 % (m/v) NaCl solution

To calculate:

Amount of NaCl in 300 mL of the solution

Firstly, we have to find out the amount of NaCl that is present in 2.0 % NaCl solution.

A 2.0 % NaCl solution indicates that 2 g of NaCl is dissolved in 100 mL of the solution.

So the amount of NaCl in 300 mL of the solution is calculated as follows:

$\begin{gathered}{\text{Amount of NaCl}}=\left({\frac{{{\text{2 g}}}}{{{\text{100 mL}}}}}\right)\left({{\text{300 mL}}}\right)\\={\mathbf{6}}\;{\mathbf{g}}\\\end{gathered}$

So 300 mL of NaCl solution contains 6 g of NaCl.

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Concentration terms

Keywords: 2.0 %, NaCl, solution, concentration, proportion, substance, mixture, molarity, molality, mole fraction, parts per million, mass percent, volume percent, mass per volume percent, m, v, m/v, m/v %, 6 g.