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Sagot :
6 gram of sodium hydroxide (NaOH) needed to make 500ml if 0.3 NaOH solution.
What is molarity?
Molarity (M) is the amount of a substance in a certain volume of solution.
Molarity is defined as the moles of a solute per liters of a solution.
The unit of molarity is mol/L.
Volume of NaOH = 500 mL
Molarity of the aqueous solution = 0.3 M
Molar mass of NaOH= (23+16+1) g = 40g
Let the mass of NaOH be X.
Now , according to formula number of moles of a given substance = given mass / molar mass
Therefore, no. of moles of NaOH = X/40
Since, molarity = number of moles of solute/ volume of solution in liter.
Hence, 0.3 = ( X /40) / (500 / 1000)
Solving this we get X= 6g
6 gram of sodium hydroxide (NaOH) needed to make 500ml if 0.3 NaOH solution.
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