Question

In: Chemistry

1. What is the molarity of a solution of NaOH if 23.4 mL required to neutralize...

1. What is the molarity of a solution of NaOH if 23.4 mL required to neutralize 25 mL of 0.25M H2SO4?

2.What is the pH of a solution produced by dissolving 1.5g HCI to make 1L of solution?

Please help, step by step solutions .. thanks!

Expert Solution

1. 2NaOH + H2SO4 ---------> Na2So4 + 2H2O

2 mole 1 mole

NaOH H2So4

M1 = M2 = 0.25M

V1 = 23.4ml V2 = 25ml

n1 = 2 n2 = 1

M1V1/n1 = M2V2/n2

M1 = M2V2n1/V1n2

= 0.25*25*2/23.4*1 = 0.534M

molarity of NaOH = 0.534M

2. molarity = W/G.M.Wt* volume of solution in L

= 1.5/36.5*1 = 0.041M

HCl -----------------> H⁺ + Cl^-

0.041M 0.041M

{H+] = [HCl]

[H+] = 0.041M

PH = -log[H+]

= -log0.041 = 1.3872

queen_honey_blossom answered 2 years ago

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