by Naomi White, Science Teacher, Jefferson High School, LAUSD

1. If you wish to weigh 250 grams of salt water and the pan weighs105.6 grams, how much will you set the balance for?

2. If this same pan weighs 108.3g after you are done boiling away thewater, how much does the salt weigh?

3. Predict the sequence of salinity from greater to lesser from lookingat the data. Then calculate the salinity and actual sequence.

sample #	mass of salt	mass of salt water	salinity	%	predicted sequence	actualsequence
1	10.0g	200g
2	6.3g	150g
3	37.0g	310g
4	1.2g	206g
5	16.4g	50g

4. 500 grams of water was boiled down, leaving 15.2g of salt. What wasthe salinity?

5. SALINITY? ________

6. How much salt do you need to add to 1000g of water to make the samesalinity as:

problem #4? ___________
problem #5? ___________

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