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You measure 2.95 mL of a 50% NaOH solution by weight (its density is 1.53 g...

You measure 2.95 mL of a 50% NaOH solution by weight (its density is 1.53 g mL-1) and dilute it to 500 mL total volume. What is the concentration of this NaOH solution? Write your answer to four decimal places (X.XXXX).

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Answer #1

50% NaOH solutions Molarity =

10*%of solute*density/molar mass of NaOH

10*50*1.53/40

= 19.125M

According to volumetric law M1V1 = M2V2

M1 = molarity of NaOH solution before dilution = 19.125M

V1 = volume NaOH solution = 2.95 ml

M2= molarity of NaOH solution after dilution =?

V2 = volume of NaOH solution after water addition =

500 ml - 2.95 ml

= 497.05 ml

M2 = M1V1/V2

= 19.125*2.95/497.05

= 0.1135 M

After water addition NaOH solution Molarity= 0.1 135 M

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