Question

1. calculate the mass of albumin to prepare a 2.5% solution in 15 ml of sterilized di water. report your answer to one decimal point.

Explanation:

Step1: Define percentage - mass formula

A 2.5% solution means 2.5 g of solute (albumin) per 100 mL of solution. Let the mass of albumin be $m$. The formula for mass - percentage is $\text{Mass}\%=\frac{\text{Mass of solute}}{\text{Volume of solution}}\times100$.

Step2: Rearrange the formula to solve for mass

We know $\text{Mass}\% = 2.5$, $\text{Volume of solution}=15$ mL. Rearranging the formula $\text{Mass}\%=\frac{m}{\text{Volume}}\times100$ gives $m=\frac{\text{Mass}\%\times\text{Volume}}{100}$.

Step3: Substitute the values

Substitute $\text{Mass}\% = 2.5$ and $\text{Volume}=15$ mL into the formula: $m=\frac{2.5\times15}{100}=\frac{37.5}{100}=0.375$ g.

Step4: Round the answer

Rounding 0.375 g to one decimal point gives 0.4 g.

Answer:

0.4 g