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以下

這是公式: concentration= _____amount of solute___________________

amount of solution

問題:

1)what will be the concentration of solution ( in g/L) if 10 g of salt is dissolved to make 200ml of salt water?

2) if a lab technician wishes to make 4 L of sodium hydroxide(NaOH) solution at a concentration of 80 g/L for

an experiment,what mass of NaOH is required?

3)during an experiment a student takes 150 ml of 60 g/L sodium chloride solution and boils away the water.

what mass of sodium chloride will remain?

4)what is the maximum amount of solution that can be made with 4 g of calcium hydroxide if the desired

concentration is 20 g/L ?

5)when a solution is diluted (watered down) the amount (volume) of solution will always___________.

whilethe concentration will always___________.

the amount (mass) of solute will__________________.

1 個解答

評分
  • 雲凍
    Lv 6
    10 年前
    最佳解答

    1. 200 ml=0.2L

    10 g/0.2 L=50 (g/L)-----The answer

    2. if the solute required is X g,then

    X/4=80---->X=320 (g)-----The answer

    3. 150 ml x 60 g/L= 9 (g)-----The answer

    4. if the volume of the solution is X L, then

    20=4/X ---->X= 0.2 (L)-----The answer

    5. When a solution is diluted (water down) the amount (volume) of soultion

    will always increases.

    While the concentration will always fails down.

    The amount (mass) of solute will keep the same.

    當一份溶液被稀釋,容易的量(體積)會增加。

    同時濃度會降低。

    溶質的量(質量)會維持不變。

    2010-05-12 12:54:13 補充:

    容易---->溶液

    參考資料: Sundial
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