It's been a long time since my last post, sorry for that. Today, I want to summarise all the ways to express a concentration of a solute in a solution.

**Mass Percentage**

\(\text{Mass Percentage }(\%)=\displaystyle \frac{\text{Mass of Solute}}{\text{Mass of Solution}}\)

**Volume Percentage**

\(\text{Volume Percentage }(\% V/V)=\displaystyle \frac{\text{Volume of Solute}}{\text{Volume of Solution}}\)

**Molality**

\(\text{Molality }(\text{molkg}^{-1})=\displaystyle \frac{\text{Amount of Solute }(\text{mol})}{\text{Mass of Solvent }(\text{kg})}\)

**Amount-of-substance Concentration**

\(\text{Amount-of-substance Concentration }(\text{molL}^{-1})=\displaystyle \frac{\text{Amount of Solute }(\text{mol})}{\text{Volume of Solution }(\text{L})}\)

I just summarise the formulas, if you have something you don't understand, just comment below!

I will be posting many problems playing with these tools, stay tuned!

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