A 38.0mL solution 0.026M solution of HCl reacts with a 0.032M NaOH.
a)calculate the number of moles of HCl originally present.
b)how many moles of NaOH are needed to neutralize the acid?
c)calculate the volume of the NaOH required to react completely with the acid

Please help me!

A 38.0mL solution 0.026M solution of HCl reacts with a 0.032M NaOH.
a)calculate the number of moles of HCl originally present.
b)how many moles of NaOH are needed to neutralize the acid?
c)calculate the volume of the NaOH required to react completely with the acid



a) You have 38 mL of 0.26 Molar solution. 0.26 Molar means 0.26 Moles per liter.

\frac {moles}{liter} \, \times \, \frac {liters}{1} = moles

So, all you have to do is this:

\frac {0.026\,moles}{Liter} \,\times\, \frac {38\,mL}{1} \,\times\, \frac {1\,Liter}{1000\,mL} = 0.000988 \, moles

b) Write the complete reaction and balance the equation.

HCl + NaOH \rightarrow H_2O + NaCl

Now you can see how many moles of NaOH react with 1 mole of HCl. Can you see what it is? Then all you do is multiply that number by the number of moles of HCl you calculated in part a). Then you have the answer.

3) You know the concentration of NaOH (0.032 moles/Liter). Use logic similar to what I used in a) to figure out the volume of NaOH you'll need.

a) You have 38 mL of 0.26 Molar solution. 0.26 Molar means 0.26 Moles per liter.

\frac {moles}{liter} \, \times \, \frac {liters}{1} = moles

So, all you have to do is this:

\frac {0.26\,moles}{Liter} \,\times\, \frac {38\,mL}{1} \,\times\, \frac {1\,Liter}{1000\,mL} = 0.00988 \, moles

b) Write the complete reaction and balance the equation.

HCl + NaOH \rightarrow H_2O + NaCl

Now you can see how many moles of NaOH react with 1 mole of HCl. Can you see what it is? Then all you do is multiply that number by the number of moles of HCl you calculated in part a). Then you have the answer.

3) You know the concentration of NaOH (0.032 moles/Liter). Use logic similar to what I used in a) to figure out the volume of NaOH you'll need.

i don't understand it

I mean why you using 0.26 moles? How did you get that number?

Actually, Perito misread the question, where the molar concentration is 0.026 M and not 0.26 M