Question

the normality of the 0.4 gram of naoh are present in the 250ml of solution​

Answer 1

Answer:

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Explanation:

What is the molarity of 4 grams of NaOH dissolved in 250 ml of solution?

The Molariry = moles of solute/volume of solution in litres ..

in order to find the moles from the mass we need to find the molar mass..

molar mass for NaOH= ( 22.9+16+1) respectively =39 g/mol

by using this simple equation we can calculate the moles of Naoh

moles= mass/ molar mass

moles=4g/39g/mole

=o.1 mole.. make sure to cancel the g with g during calculation .

now I have the moles and I have the volume I can calculate the molarity, but I have one simple problem that the volume is in (ml )and is supposed to be in (liter).

1 litre=1000ml

simple divide what we have over what we want

250 ml/1000 liter =0.25 litre yay

Now execute

molarity= moles/ volume

Molarity =0.1 mole/0.25 liter

=0.4 M or mole/liter.. don't forget to write the measurement unit for molarity to get extra grade ..