If I need to prepare 20 mL of a liquid mixture in a 3:1 ratio, how much of each liquid should I use?
Question: If I need to prepare 20 mL of a liquid mixture in a 3:1 ratio, how much of each liquid should I use?
Solution:
Step 1: Understand the ratio.
A 3:1 ratio means there are 3 parts of the first liquid for every 1 part of the second liquid.
Step 2: Calculate the total number of parts.
Total parts = 3 + 1 = 4 parts.
Step 3: Calculate the volume of 1 part.
One part = Total volume ÷ Total parts
One part = 20 ÷ 4 = 5 mL.
Step 4: Calculate each liquid.
First liquid = 3 × 5 = 15 mL.
Second liquid = 1 × 5 = 5 mL.
Therefore, to make 20 mL of a 3:1 mixture, use 15 mL of the first liquid + 5 mL of the second liquid.
Final mixture = 15 + 5 = 20 mL.
A 3:1 ratio means there are 3 parts of the first liquid for every 1 part of the second liquid.
Step 2: Calculate the total number of parts.
Total parts = 3 + 1 = 4 parts.
Step 3: Calculate the volume of 1 part.
One part = Total volume ÷ Total parts
One part = 20 ÷ 4 = 5 mL.
Step 4: Calculate each liquid.
First liquid = 3 × 5 = 15 mL.
Second liquid = 1 × 5 = 5 mL.
Therefore, to make 20 mL of a 3:1 mixture, use 15 mL of the first liquid + 5 mL of the second liquid.
Final mixture = 15 + 5 = 20 mL.
Equation/Formula:
partSize = totalVolume ÷ (ratioA + ratioB)
liquidA = partSize × ratioA
liquidB = partSize × ratioB
liquidA = partSize × ratioA
liquidB = partSize × ratioB
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