Volume of an acid required to change the pH of a buffer solution

What volume (in mL) of 0.37M HCI solution must be added to 265.00 mL 0.29M ammonia solution to give a buffer solution with pH 9.1? (Kb for ammonia 1.80e-5) 1.80 x10^-5

Solution Preview

The equation to calculate the pH of a buffer solution is:
pH = pKa - log [HA]/[A-]
The most important thing here is to recognize what our buffer system is. This is going to be an NH4+/NH3 buffer, where the acid component is NH4+ (HA), and the base component or the "anion" is NH3. Only NH4+ can be HA, i.e. an acid (we're looking for a weak acid), because NH4+ can lose a proton and become NH3. The pKa of a conjugate acid formed from a base (in this case NH4+ formed from NH3 can be calculated from the ...

Solution Summary

Full solution using the equation to calculate the pH of a buffer solution is pH = pKa - log [HA]/[A-]. 400 words.

... the theoretical pH of solutions of weak acids/bases, (iv ... Since an equal volume is added, the amount of HCl added = 1L ... so it will react with the weak acid (HCO3(1 ...

... Assume that the volumes of the solutions are additive. ... the moles in solution divided by the volume of solution... 1 mM or less), or heavily skewed acid/base ratios ...

... After you calculate the required volumes, calculate the actual final ... for the preparation of a volume of buffer... of concentration of the salt and acid should be ...

... Calculate the pH after the following volumes of titrant have been added ... (Neglect volume changes. ... The acid required 15.5 mL of base to reach the equivalence point ...

... Thus for your problem we need to calculate the number of ... Since each is dissolved in a volume of 250 ml ... can calculate the concentration of both the acid and base ...

... 4. What volume of 0.500 M HNO3 is needed to titrate ... Assume that the volumes of the solutions are additive. ... to small additions of either a strong acid or strong ...

... If not 95%, do we need a higher or lower concentration ... want to prepare 500 mL of pH = 7.4 of carbonic acid buffer. ... 3.00 M HCl 3.00 M NaOH What volumes of what ...

... water) Find moles of each, and you will see that the strong acid is in ... to find out what is leftover, and then an addition of volumes to find total volume. ...

... So, the titration curve tells us the volume of base required... amino acid groups all act as weak acids/bases - it ... of Alanine at pH 0.5) the amino acid is a ...

...buffer solution contains 0.12mol of propionic acid(HC3H5O2) and ... Calculate the pH after the following volumes of titrant ... of KHP and has a final volume of about ...