Multiple Choice
If you perform a series of 4 consecutive 10-fold dilutions, what is the final dilution factor relative to the original solution?
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6. Chemical Quantities & Aqueous Reactions
Dilutions
Multiple Choice
How many milliliters of a 25% (m/v) NaOH solution are required to obtain 75 g of NaOH?
A
25 mL
B
300 mL
C
75 mL
D
375 mL
Verified step by step guidance1
Understand that a 25% (m/v) NaOH solution means there are 25 grams of NaOH in every 100 mL of solution.
Set up a proportion to find the volume of solution needed to get 75 grams of NaOH: if 25 g is in 100 mL, then 75 g will be in x mL.
Write the proportion as \(\frac{25\ \text{g}}{100\ \text{mL}} = \frac{75\ \text{g}}{x\ \text{mL}}\).
Solve for \(x\) by cross-multiplying: \(25 \times x = 75 \times 100\).
Isolate \(x\) by dividing both sides by 25: \(x = \frac{75 \times 100}{25}\), which gives the volume in milliliters needed.
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