A solution has been prepared by dissolving 0.63 g of HNO3 in 100 ml.What is its pH value ?
To find the pH value of a solution, we need to know the concentration of the hydrogen ion (H+). In order to find the concentration, we can use the formula:
[H+] = (moles of H+ ions) / (volume of solution in liters)
Step 1: Calculate the number of moles of HNO3
To find the number of moles, we can use the formula:
moles = mass / molar mass
The molar mass of HNO3 is calculated as follows:
H = 1 g/mol
N = 14 g/mol
O = 16 g/mol (3 O atoms)
Molar mass of HNO3 = (1 * 1) + (14 * 1) + (16 * 3) = 1 + 14 + 48 = 63 g/mol
moles = 0.63 g / 63 g/mol = 0.01 mol
Step 2: Calculate the concentration of H+ ions
Volume of solution = 100 ml = 100/1000 L = 0.1 L
[H+] = (0.01 mol) / (0.1 L) = 0.1 M
Step 3: Calculate the pH value
pH = -log[H+]
pH = -log(0.1)
Using a scientific calculator, we can find that the logarithm of 0.1 is -1
pH = -(-1) = 1
Therefore, the pH value of the solution prepared by dissolving 0.63 g of HNO3 in 100 ml is 1.
To calculate the pH value of a solution, you will need to know the concentration of the hydrogen ion (H+) in the solution. In this case, we can calculate the concentration of H+ using the concentration of the HNO3 solution.
First, convert the mass of HNO3 to moles using the molar mass of HNO3, which is 63.01 g/mol.
Number of moles of HNO3 = mass / molar mass
Number of moles of HNO3 = 0.63 g / 63.01 g/mol
Number of moles of HNO3 = 0.01 mol
Now, calculate the concentration of H+ in the solution using the formula:
Concentration (mol/L) = moles of solute / volume of solution (in liters)
Concentration of H+ = 0.01 mol / 0.1 L
Concentration of H+ = 0.1 mol/L
To find the pH value, you can use the equation:
pH = -log[H+]
pH = -log(0.1)
pH = -(-1)
pH = 1
Therefore, the pH value of the solution prepared by dissolving 0.63 g of HNO3 in 100 mL is 1.