questions about concentration?

2

Posted on : 09-03-2014 | By : My Study Coach | In : Improve Your Concentration
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If you add 5mL of water to 5mL of 6.0M Nacl solution, what is the concentration of the final solution?

I know the formula for normal concentration is amount of solute/amount of solution. But it seems not the right formula to solve this question. I am so confused.

Also if add enough water to 20mL of 2.0M glucose to make final volume of 100mL, what is the final concentration of the solution?

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Comments (2)

Use this formula: initial volume x initial concentration = final volume x final concentration

where volume is in liters.
You can convert your volume unit to liter by dividing the given volume by 1000.

For the first problem, the initial volume is 5 and the final volume is 10.

Hi Lol

we use the formula C1V1=C2V2

“if you add 5mL of water to 5mL of 6.0M Nacl solution, what is the concentration of the final solution?”

C1= 6.0M
V1= 5 mL

C2= ?
V2= 10 mL

……….C1V1…….( 6.0 M )( 5 mL )
C2 = ———– = ————————— = 3 M final concentration
………..V2……………(10 mL)

“if add enough water to 20mL of 2.0M glucose to make final volume of 100mL, what is the final concentration of the solution?”

C1= 2.0M
V1= 20 mL

C2= ?
V2= 100 mL

……….C1V1…….( 2.0 M )( 20 mL )
C2 = ———– = ————————— = 0.4 M final concentration
………..V2……………(100 mL)

Good luck

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