June 07, 2020, 02:27:01 AM
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### Topic: How much Na2EDTA.2H2O do i need to weigh to get a 0,01M solution in 250 ml water  (Read 155 times)

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#### 1800chisaki

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##### How much Na2EDTA.2H2O do i need to weigh to get a 0,01M solution in 250 ml water
« on: May 05, 2020, 11:01:58 AM »
i did the following;

n edta = c edta x V H2O
n edta = 0,01 x 250 ml = 2,5 mmol

do i need to multiply n by 2 since edta is a dihydrate? edta is in the H2Y2- form here

further: m edta = n edta x Mr edta
m edta = 2,5 mmol x 372,24 mg/mmol = 930,6 g

#### AWK

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##### Re: How much Na2EDTA.2H2O do i need to weigh to get a 0,01M solution in 250 ml water
« Reply #1 on: May 05, 2020, 11:24:48 AM »
Quote
2,5 mmol x 372,24 mg/mmol = 930,6 g
Wrong unit
AWK

#### 1800chisaki

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##### Re: How much Na2EDTA.2H2O do i need to weigh to get a 0,01M solution in 250 ml water
« Reply #2 on: May 05, 2020, 11:35:14 AM »
Quote
2,5 mmol x 372,24 mg/mmol = 930,6 g
Wrong unit

typo, but is my calculation correct? edta being a dihydrate doesnt change anything?

#### AWK

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##### Re: How much Na2EDTA.2H2O do i need to weigh to get a 0,01M solution in 250 ml water
« Reply #3 on: May 05, 2020, 11:36:55 AM »
After all, you took into account the molar mass of dihydrate.
AWK