# science

posted by astrid

Erin must perform a science experiment. She needs to dissolve 10 g of salt in 250 ml of water. She measures the water incorrectly and dissolves the 10 g of salt in 350 ml of water. Now she has no more salt. Explain what Erin can do to make the solution accurate.

1. Ms. Sue

She could add more salt.

Solve this proportion to find how much salt is needed in 350 ml.

250 / 350 = 10 / x

2. astrid

She can't add more salt because she has no more salt.

3. Ms. Sue

Oops! Sorry. I didn't read the entire question.

The only other solution I see is to let the excess water evaporate.

4. astrid

So if she lets the water evaporate, she can use the remaining salt to use it in another cip with 250 ml of water

5. Ms. Sue

She only needs to let the excess water (100 ml) evaporate.

6. astrid

How can she make sure its 100 ml?

7. Ms. Sue

She can note the amount of salt and water in a flask marked in ml.

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