What volume of a concentrated hcl solution which is 36% by mass and has a density of 1.179 g/ml to make 4.85L of an hcl solution with ph of 1.9?
Who helps me to solve it for me.
how to calculate PH =1.9 therefore =0.0126M
I do not understand only this part about PH = 0.0126M Please tells me how to calculate the PH = 1.9 = 0.0126M
Other way to calculate
0.0126Moles = PH 1.9
0.0126M x 4.85L=0.061mole
0.061mole x 36.46 = 2.22g
2.22g /0.36 = 6.16
6.16/1.179 = 5.23ml
A 0.446g sample of an unknown monoprotic acid was titrated with 0.105M KOH the molar mass is 120g/mol. What is the PKA value
Who helps me to solve it for me. Please help
I gave some explanation for pH = 1.9 at the other post. Here is how you do it on your calculator.
pH = -log(H^+)
-1.9 = log(H^+).
Punch in 1.9 on your calculator and change the sign to -. Then hit the 10x button and the calculator will read 0.01259.
I can help you solve this problem. To find the volume of a concentrated HCl solution needed to make a solution with a given pH, we need to consider several steps:
Step 1: Calculate the molarity of the desired HCl solution.
Step 2: Convert the mass percentage to mass and then to moles.
Step 3: Use the molarity and the volume to determine the moles of HCl required.
Step 4: Use the density to convert the moles to volume.
Let's break down each step:
Step 1: Calculate the molarity of the desired HCl solution.
pH is a measure of the concentration of H+ ions in a solution. A pH of 1.9 indicates a concentration of 0.012 M (using the formula pH = -log[H+]).
Step 2: Convert the mass percentage to mass and then to moles.
The concentrated HCl solution is 36% by mass. This means that 36g of the solution contains 100g of HCl. To calculate the mass of HCl needed, we can set up the following equation:
mass HCl = (36g/100g) * mass of solution
Step 3: Use the molarity and the volume to determine the moles of HCl required.
moles HCl = molarity * volume HCl solution needed
Step 4: Use the density to convert the moles to volume.
To determine the volume of the 36% HCl solution needed, we can use the following equation:
volume HCl solution needed = (moles HCl / density of HCl solution)
By following these steps, you can calculate the volume of the concentrated HCl solution needed to make 4.85L of an HCl solution with a pH of 1.9.
pH = 1.9; therefore, (H^+) = 0.0126 M
M HCl = 1.179 x 1000 x 0.36 x (1/molar mass HCl) = about 11.6M
Then 11.6M*xmL = 0.0126M*4,850 mL.
Solve for x mL