This question is incomplete, the complete question is;
The flask contains 10.0mL of HCl and a few drops of phenolphthalein indicator.
The buret contains 0.320 M NaOH,
It requires 11.2 mL of the NaOH solution to reach the end point of the titration
What is the initial concentration of HCI?
Answer:
initial concentration of HCl is 0.3584 M
Explanation:
Given that;
the reaction between HCl and NaOH is 1:1 molar
HCl(aq) + NaOH(aq) -------> NaCl(aq) + H2O(l)
we know that molarity is the number of moles of solute per liter of solution
so moles of NaOH consumed
= ( 0.320 mol / 1000ml) × 11.2ml
= 0.003584 mol
now
0.003584 moles of NaOH reacts with 0.003584 moles of HCl
moles of HCl present in the 10.0ml solution = 0.003584 mol
therefore the initial concentration of HCl
= ( 0.003584 mol / 10.0ml )× 1000ml
= 0.3584 M
the initial concentration of HCl is 0.3584 M
