when 50 ml of an HNO3 solution is exactly neutralized by 150 ml of a 0.50 M solution of KOH, what s the concentration of HNO3
1.5
To find the concentration of HNO3, we can use the concept of stoichiometry.
Step 1: Write the balanced chemical equation for the neutralization reaction:
HNO3 + KOH → KNO3 + H2O
Step 2: Determine the number of moles of KOH used:
From the given information, we know that the volume of the KOH solution used is 150 ml (0.150 L) and the concentration of KOH is 0.50 M.
Number of moles of KOH = concentration × volume
Number of moles of KOH = 0.50 M × 0.150 L = 0.075 moles
Step 3: Determine the number of moles of HNO3 used:
According to the balanced equation, the stoichiometric ratio of KOH to HNO3 is 1:1. Therefore, the number of moles of HNO3 used is also 0.075 moles.
Step 4: Determine the concentration of HNO3:
Since we have 0.075 moles of HNO3 in 50 ml (0.050 L) of solution, the concentration of HNO3 is given by:
Concentration of HNO3 = Number of moles / Volume
Concentration of HNO3 = 0.075 moles / 0.050 L = 1.5 M
Therefore, the concentration of HNO3 is 1.5 M.
To find the concentration of HNO3, we can use the concept of stoichiometry.
The balanced chemical equation for the reaction between HNO3 (nitric acid) and KOH (potassium hydroxide) is:
HNO3 + KOH → KNO3 + H2O
From the equation, we can see that the stoichiometric ratio of HNO3 to KOH is 1:1. This means that 1 mole of HNO3 reacts with 1 mole of KOH.
Given that 50 ml of HNO3 solution (unknown concentration) is exactly neutralized by 150 ml of a 0.50 M solution of KOH, we can calculate the number of moles of KOH used.
Volume of KOH solution = 150 ml
Concentration of KOH solution = 0.50 M
Using the formula:
Moles = Concentration × Volume
Moles of KOH = 0.50 M × 150 ml = 0.50 moles
Since the stoichiometry between HNO3 and KOH is 1:1, the number of moles of HNO3 is also equal to 0.50 moles.
Now, we can calculate the concentration of HNO3.
Volume of HNO3 solution = 50 ml = 0.05 L
Moles of HNO3 = 0.50 moles
Using the formula:
Concentration = Moles / Volume
Concentration of HNO3 = 0.50 moles / 0.05 L = 10 M
Therefore, the concentration of the HNO3 solution is 10 M.