A concentration of 1 ppm means that

Options

A. 1 kg of solution contains 1 mg of solute
B. 1 kg of solution contains 1 g of solute
C. 1 kg of solution contains 1 mL of solute
D. 1 g of solution contains 1 g of solute

Answer

To solve the question regarding the meaning of 1 ppm (parts per million), we can break it down into the following steps:

### Step 1: Understand the Definition of PPM
PPM stands for "parts per million." It is a unit of measurement used to describe the concentration of a substance in a solution or mixture.

**Hint:** Remember that ppm is a way to express very dilute concentrations.

### Step 2: Relate PPM to Mass
1 ppm specifically means that there is 1 part of a substance (solute) for every 1 million parts of the total solution. In terms of mass, this can be expressed as:
- 1 ppm = 1 milligram of solute in 1 kilogram of solution.

**Hint:** Think about how mass ratios work when dealing with large quantities.

### Step 3: Convert Units if Necessary
To further clarify, we can convert the units:
- 1 kilogram = 1,000 grams
Thus, 1 ppm can also be expressed as 1 mg of solute in 1,000 grams of solution.

**Hint:** Always check if you need to convert units for better understanding.

### Step 4: Conclusion
Therefore, the correct interpretation of a concentration of 1 ppm is that it represents 1 milligram of solute present in 1 kilogram of solution.

**Hint:** Summarize the key points to reinforce your understanding.

### Final Answer
A concentration of 1 ppm means that there is 1 milligram of solute in 1 kilogram of solution.

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