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11 Dec 2019

1. how many ml of a 0.1M solution of HCl are necessary to bring a 50ml solution of 0.5 M NaOH to neutral pH

2. You have a solution of phosphoric acid. The volume of the solution is 50mL and the concentration of phosphoric acid is 0.1M. You add 60mL of a 0.1M solution of sodium hydroxide to your phosphoric acid. What should be the pH of the resulting solution?

***Please explain me with details.

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Irving Heathcote
Irving HeathcoteLv2
13 Dec 2019

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Related questions

It's a two part question
1. Calculate the pH of a buffer solution made by adding 5.0g ofanhydrous sodium acetate (NaC2H3O2) to 50mL of 0.100 M acedticacid. Assume there is no change in volume on adding the salt to theacid. pKa for acetic acid is 4.7.

Buffer capacity refers to the amount of acid or base a buffer canabsorb without a significant pH change. A 0.5M buffer can absorb 5xas much acid or base as a 0.1M buffer for a given pH chnage.

You are given 60mL of 0.50M phosphate buffer, pH= 6.83. Thestarting composition of the buffer, both in terms of concentrationand molar quantity of two major phosphate species is:
Concentration of HPO4^2-= 0.304M
Concentration of H2PO4-= 0.196M
Molar quantity of HPO4^2-= 18.2 mmol
Molar quantity of H2PO4-= 11.8 mmol

a) You add 1.7 mL of 1.00 M HCL to the buffer. Calculate the molarquantity of H30+ added as HCL and the final molar quantity ofHPO4^2- and H2PO4- at equilibrium?

b) What is the new HPO4^2-/H2PO4- ratio and new pH of solution? ThepKa of H2PO4- is 6.64. Use henderson-hasselbach.

C) Now take a fresh 60mL of the 0.50M pH of 6.83 buffer and add3.7mL of 1.00M NaOH. Caclulate the new pH of the solution.

Prepare a solution that is 0.1M acetic acid and 0.1M sodium acetate by measuring out 5.0 ml of each and diluting to 50.0 ml with water. The Ka for acetic acid is 1.8x10^-5

What is the PH after adding 1.00 ml of 1.0 M sodium Hydroxide bringing the total volume to 51 ml

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