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I am going to assume that your "exactly" has some reasonable leeway associated with it. Molar concentration = (no. of mols)/volume (in L). Therefore 4.75 M = (no of mols) /0.25 L Therefore no. of mols = 0.25 * 4.75 = 1.1875 mols Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol Therefore mass of 100 % NaOH required = 1.1875 mol * 40 g/mol =47.5 g NaOH So - in detail, you would weigh out the mass of solids NaOH, dissolve it in 250 ml of water and you would have the required solution. The volume won't be EXACT, but close as.

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15y ago
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12y ago

0.250 Mols in 1 litre, so there are 0.5 mols in 2 litres.

0.5 mols NaOH * 40 grams NaOH(molecular weight) = 20 grams NaOH.

Therefore, just add 20 grams of NaOH to water, and your good to go!

Hope this helps :D

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11y ago

For making 1 MSolution, 40 gm NaoH dissolved in 1000 ml Distilled water .then10 ml solution of 1 M (Stock solution) dissolved in 500 ml distilled water for 0.02 M NaOH solution.

R.C Joshi.

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9y ago

1. Weigh 0,8 g ultrapure dried NaOH.
2. Transfer NaOH in a clean 1 L volumetric flask using a funnel. 3. Wash the funnel with 0,9 L demineralized water.
4. Put the flask in a thermostat and maintain 30 min at 20 0C.
5. Add demineralized water up to the mark.
6. Stir vigorously and transfer in a clean bottle with stopper.
7. Add a label with necessary information.

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Q: How do you prepare 0.02 M NaOH from 1 M NaOH?
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