so we have the right to sassist ; if want prepare 1 molar NaOH solution then we need 40 gm NaOH disfix in one liter of water so it came to be one 1 molar NaOH solution.

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so we deserve to said ; if want prepare 1 molar NaOH solution then we require 40 gm NaOH dissettle in one liter of water so it became one 1 molar NaOH solution.

Weigh 39.9 gm of NaOH pellets & disfix them in one liter of water, what you will certainly be having currently is 1M NaOH solution.
For calculations, you might wish to employ digital devices such as - https://www.graphpad.com/quickcalcs/molaritydevelop.cfm

Your stock solution of Sodium Hydroxide is calculated to be 37.875 M based upon a thickness of 1.515 g/mL, a formula weight of 40 g/mol, and a concentration of 100% w/w.
To make a 1 M solution, gradually add 26.403 mL of your stock solution to 250 mL deionized water.Adsimply the last volume of solution to 1000 mL through deionized water.
Reference : https://www.sigmaaldrich.com/chemistry/stockroom-reagents/learning-center/technical-library/molarity-calculator.html

Be carefull as soon as you execute that. Do not add the water on the pellets! Take a part of water and also include to the becker. Then, include the pellets carefully. After that, include the remainder of the water mixing very closely (constantly under vent).

Take the pellets in to a 1lt measuring cylinder and also add 1/3 of distilled water and swirl. Once it is totally liquified, consist of the solution upto 1lt mark in the measuring cylinder.
To make 1 M NaOH solution, you need to disfix 40.00 g of sodium hydroxide pelallows in 250 mL distilled water and then consist of the solution to 1 liter.
Weigh 19.95 gm of NaOH pellets & disfix them in half liter(500ml) of distilled water water, what you will certainly be having currently is 1M NaOH solution.
You need to take right into account the purity of your pelallows. e.g., ACS reagent grade pelallows are >97% so you can end up through between 0.97M. Also, you have to be mindful around the hygroscopicity. The pelallows will easily pick up moisture from the environment which will cause you to overestimate the mass of NaOH you dispense.
John Francis Miller, Does it expect that if the purity of your pellet is 96%; we can finish up via 0.96M? IF so, just how deserve to we consist of to precisely 1M?
To make 1 M NaOH solution, you need to disdeal with 40.00 g of sodium hydroxide pelallows in 250 mL distilled water and then consist of the solution to 1 liter
Haruna Kolawole Afolabi - you should recognize the purity of your pelallows. To do that, you should make a solution with a known mass concentration of your pellets and also titrate it against an acid of recognized concentration.

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If you simply want approx. 1M, then by all suggests skip this and simply dissettle 40g in 1 liter of water as others imply. But you say you want it "exact", so you need to "standardize" your solution. See this (bottom third of the page is many relevant):
Why is this so hard to explain? You need to account for the impurities in the pelallows if you want a specific 1M solution. Disaddressing 40g of SigmaAldwealthy NaOH pelallows is not the very same as disaddressing 40g of pure NaOH. Pelallows of NaOH have actually the additional difficulty of hygroscopicity. You need to standardize your solution.
First weigh 40g NaOH in breaker and disdeal with via 400 to 500 mL via purified water. Then enable to cool the solution and also volume upto 1000 mL via purified water. Then standardization your Solution.
If you must prepare approximately one liter of 1 M NaOH solution, you disresolve the molar mass of NaOH (40.0 g) making use of distilled water in a beaker, then transfer this solution to a one liter volumetric flask and rinse the beaker through distilled water a number of times and also put it in the volumetric flask, and also ultimately fill the volumetric flask with distilled water to the mark. To understand the specific molarity of NaOH, you should standardize it through a major conventional material favor potassium hydrogen phthalate (KHP). Now this solution is dubbed secondary traditional solution and need to be frequently standardized prior to usage, because its molarity changes with time and also reduces as it reacts through the atmospheric CO2 as soon as you open it from time to time. Then after that you deserve to use it to find the molarity of various other unwell-known acid options or the molar mass of an unrecognized acid.