A solution of 0.365g of HCl per L of water is prepared and 10.0ml of this is the diluted to 100ml. what is the pH of the solution? (HCl=36.5g/mole)

Expert Answers

An illustration of the letter 'A' in a speech bubbles

The mols of HCl present in 0.365g is,

n = 0.365 g / 36.5 g/mol

n = 0.01 mol.

Now this is in 1 L. If you take 10ml out of this and dilute it upto 100 ml, the concentration has been diluted 10 times.

Therefore final concentration is, C,

C = (0.01 mol/l)/10

C = 0.001 mol per liter.

HCl disassociates according to following reaction,

HCl ------> H+   + Cl-   

Therefore the [H+] concentrtion is 0.001 mol per litre.

The definition of pH is,

pH = -log[H+]

pH = -log[0.001]

pH = -(-3)

pH = 3

The pH of the solution is 3.

See eNotes Ad-Free

Start your 48-hour free trial to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.

Get 48 Hours Free Access
Approved by eNotes Editorial