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17 Nov 2019

A weak acid (HQ) has pKa of 6.72 (Ka=1.905x10^-7). We have a 0.25M solution of HQ and 0.15M solution of sodium hydroxide (NaOH).

How many ml of each solution will be needed to prepare 350ml of a buffer solution whose pH is 7.22?

a) ml of 0.25M acid

b) ml of 0.15M NaOH

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Trinidad Tremblay
Trinidad TremblayLv2
12 Aug 2019

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Related questions

I performed an experiment to find the equivalent mass anddissociation constant of an unknown weak acid by titrimetry.

My data is the following:

A.) Determining a satisfactory sample size for the unknown weakacid:

Mass of unknown acid, 0.12 grams

Final buret reading: 5.6 mL

Initial buret reading: 0.0mL

Volume of NaOH solution required: 5.6mL

Mass of unknown acid requiring 25mL of NaOH solution fortitration: 0.54grams

Volume of NaOH solution required: 300mL

Molarity of NaOH solution: 0.25M

B.) Titrating a sample of an unknown weak acid

Mass of weighing paper plus unknown acid: 0.91grams

Mass of weighing paper: 0.37 grams

Mass of unknown acid: 0.54grams

C.) Buret readings of first and second determinations:

First determination:

13.5mL = 3.82 pH

26.5mL = 7.60 pH

Second determination:

13.5mL = 3.74 pH

27.0mL = 7.60 pH

pKa of acid: 3.82 / 3.74

Ka: 1.85x10^-4 / 1.82x10^-4

Find the following for both determinations 1 and 2:

Volume of NaOH solution required to reach equivalence point, mL:?

Number of equivalents of NaOH required to reach equivalencepoint: ?

Number of equivalents of unknown acid titrated, equiv: ?

Equivalent mass of unknown acid, g/equiv: ?

It's a two part question

1) Give the expected hybridization of the central atom in thefollowing molecules


sulphur in SF6

oxygen in H2O

seleniurn SeO3

phosphorus in PBr5

tellurium in TeF4


2) if we trcat H2O as weak acid , and H2O+ as bronted acid, whatwould be the Equation for their ionization constants (Ka) ?



3) culculate the pH of the 0.25M NH3 \ 0.30M NH4CL buffersystem. what is the pH after the addition of (i) 40ml of 0.15M NaOHand (ii) 30ml of 0.20M HCl to 60ml of thebuffer solution ?


4) circle the molecules with a dipole moment ?


NH3 , CO2 , CHCl3 , CH4 , SO2


5) calculate the percentage ionization of benzoic acid at thefollowing concentration : assume the approximation for both casesto be correct : a) 0.20M b) .0.00020M



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