Question

If 75 g of active ingredient powder is mixed with 400 mL NS solution, what is the final concentration? Round to the nearest hundredths (w/v)."(w/v)" is telling you to divideW = weight the gramsV = volume which is the mLAnswer will be in % nothing else! -3 pointsACTIVE INGREDIENT DIVIDED BY THE mL Active ingredient is 75 gramsRound to the hundredth placeFINISH THE MATH FOR THE CORRECT ANSWERActive ingredient is ____ grams--------------------------------- = then multiply by 100 for the answer in %Total is ____ mLThis formula means to divide first then multiply by 100 and go to the second place right of the decimal on the calculator. Do not round

Answer 1

1) List the known and unknown quantities.

Active ingredient: 75 g.

Solution: 400 mL.

2) Set the equation.

Mass/volume percent

`(M)/(V)\%=\frac{grams\text{ }of\text{ }solute}{milliliters\text{ }of\text{ }solution}*100`

3) Plug in the known quantities.

`\%=\frac{75\text{ }g}{400\text{ }mL}*100`
`\%=18.75\%`

The concentration of active ingredient is 18.75%.

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