Respuesta :
Answer:
8.9357.
Explanation:
So, let us dive right into the solution to the above problem;
We have that the volume of the solution = 0.450 L.
The first thing to do is to determine the number of moles by using the formula below:
Pressure × volume = number of moles × gas constant × temperature.
Therefore, making the number of moles the subject of the formula we have;
Number of moles = (pressure × volume)/ has constant × temperature.
Number of moles of NH3=( 735 × 7.50 )/ 62.4 × 295 = 0.2995 moles.
The number of moles of HCl =
0.450 × 0.450 = 0.2025 moles.
Molarity of HCl = 0.2025 moles/ 0.450 L = 0.45M.
The molarity of {OH^-} = (0.2995 moles - 0.2025 moles) /0.450 = 0.097/0.450 = 0.2156 M.
Therefore, kb = 1.8 × 10^-5 = [ 0.450] [OH^-] / [ 0.2156 M] = 0.000008624.
[OH^-] = 0.000008624.
Hence, pOH = 5.0643.
pH = 14 - 5.0643 = 8.9357.
8.9 is the pH of the resulting solution.
What is pH?
pH of any solution tells about the acidity or basicity of that solution.
In the question given that:
Pressure = 735 torr
Temperature = 22 degree C = 295 K
Volume of NH₃ gas = 7.50 L
Volume of HCl solution = 0.450 L
Molarity or concentration of HCl solution = 0.450 M
Kb value for NH₃= 1.8 x 10⁻⁵
First we calculate the no. of moles of NH₃ gas, by using the below formula:
PV = n RT, where R = gas constant = 62.4 L.Torr / K.mol
n = ( 735 × 7.50 )/ 62.4 × 295 = 0.2995 moles
The number of moles of HCl can be calculated by using the formula:
M = n/V
n = 0.450 × 0.450 = 0.2025 moles.
The molarity of {OH⁻} = (0.2995 moles - 0.2025 moles) /0.450 = 0.097/0.450 = 0.2156 M
Therefore, kb = 1.8 × 10⁻⁵ = [ 0.450] [OH^-] / [ 0.2156 M] = 0.000008624
[OH⁻] = 0.000008624
Hence, pOH = 5.0643
pH = 14 - 5.0643 = 8.9357
Hence, pH of the resulting solution is 8.9.
To know more about pH, visit the below link:
https://brainly.com/question/172153
