What is the pH of a solution prepared to contain 155 grams of HCl in 200.0 mL?
Can you tell me how to do it? I can't remember how...
Convert 155 g HCl to moles.
moles = grams/molar mass
Then M = moles/L soln.
Then pH = -log(HCl)
I wonder if you made this up for us to show you how to work a problem on pH because the numbers I get are not realistic.
its a problem on my homework but thanks you for showing my what to do. its much appreciated
To determine the pH of a solution, you will need to know the concentration of hydrogen ions, which is represented by the concentration of H+. In order to calculate the concentration of H+ in the solution, we need to use the equation for molarity (M):
Molarity (M) = moles of solute / volume of solution (in liters)
Given:
Mass of HCl = 155 grams
Volume of solution = 200.0 mL = 0.2000 L (since 1 mL = 0.001 L)
First, we need to convert the mass of HCl to moles. To do this, we will use the molar mass of HCl, which is 36.461 grams/mol.
Moles of HCl = Mass of HCl / Molar mass of HCl
= 155 g / 36.461 g/mol
Next, we can calculate the molarity of the solution:
Molarity of HCl = Moles of HCl / Volume of solution (in liters)
= (155 g / 36.461 g/mol) / 0.2000 L
Finally, to determine the pH of the solution, you need to take the negative logarithm (base 10) of the concentration of H+ ions. The formula is:
pH = -log[H+]
where [H+] represents the concentration of H+ in moles per liter.
So, once you have the molarity of HCl, you can use this value to calculate the hydrogen ion concentration and then find the pH.