Chemistry

Chemistry, 27.07.2019 02:30, corriganpelton

Why does a solution of a weak base and its conjugate acid act as a better buffer than does a solution?

answer

Answers: 1

Show answers

Similar questions

Предмет

Chemistry, 27.06.2019 20:50, Maddoxaustin1

Which statements about buffers are true? the principle behind a buffering solution is that the ph changes the least per added increment of acid or base at the p k a. a buffer solution is an aqueous solution of a weak acid and its conjugate base. the henderson-hasselbalch equation does not apply to buffering solutions. buffered solutions can minimize the change in ph, because the conjugate acid and conjugate base of the buffer are present in sufficient concentration to combine with and neutralize added h+ or oh–

Answers: 2

Предмет

Chemistry, 02.09.2019 18:30, amoore51

There are two common ways to make a buffer: i) add relevant amounts of weak acid (or base) and conjugate base (acid) together, or ii) add strong acid to the weak base (or strong base to weak acid). a) what mass of na2co3(s) must be added to 250 ml of 0.30 m nahco3(aq) to give a ph 9.75 buffer solution, given pka (hco3) = 10.25? b) what mass of naoh(s) must be added to the same 250 ml solution of 0.30 m nahco3(aq) to give the same ph 9.75 buffer solution? c) sketch the speciation curve of this buffer for 2 ph units either side of the requested buffer ph. indicate quantitatively, the ph at which the cross-over point between the two species lies. in both cases, you may assume no change in volume when the solid is added.

Answers: 1

Предмет

Chemistry, 04.10.2019 20:20, elijahmoore841

Er solutions can be produced by mixing a weak acid with its conjugate base or by mixing a weak base with its conjugate acid. the henderson-hasselbalch equation, ph=pka+log[base][acid] allows you to calculate the ph of a buffer. note that molarity, moles, and millimoles are all proportional, so you can substitute the number moles, or millimoles, for the concentration terms in this formula. part a you need to produce a buffer solution that has a ph of 5.03. you already have a solution that contains 10. mmol (millimoles) of acetic acid. how many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution? the pka of acetic acid is 4.74.

Answers: 2

Предмет

Chemistry, 06.10.2019 01:00, KOAL

Olutions that contain a weak acid, ha, and its conjugate base, a−, are called buffer solutions because they resist drastic changes in ph. when a solution contains a weak acid and its conjugate base or a weak base and its conjugate acid, it will be a buffer solution. for buffers containing a weak acid, the principal reaction is ha(aq)+h2o(l)⇌h3o+(aq)+a−(aq) unbuffered, a weak acid would ionize and the net reaction would proceed forward to reach equilibrium. however, when a significant amount of conjugate base is already present, the extent of the net reaction forward is diminished. thus, equilibrium concentrations of ha and a− are approximately equal to their initial concentrations. visualizing buffers you can visualize a buffer solution containing approximately equal concentrations of ha and a− in action using the following equation, where ka is the equilibrium constant: ka[h3o+]==[h3o+][a−][ha]ka[ha][a−] when the concentrations of ha and a− are relatively large, the addition of a small amount of acid or base changes their concentration negligibly. the result is that the ratio [ha]/[a−] maintains a value approximately equal to 1, and the [h3o+] is approximately equal to the ka value under buffer conditions. part a calculate the ph of the solution made by adding 0.50 mol of hobr and 0.30 mol of kobr to 1.00 l of water. the value of ka for hobr is 2.0×10−9. express your answer numerically

Answers: 1

Do you know the correct answer?

Why does a solution of a weak base and its conjugate acid act as a better buffer than does a solutio...

Questions in other subjects:

Konu

Mathematics, 11.03.2021 19:30

9x - 6 = 9x + h help pls...

Konu

Mathematics, 11.03.2021 19:30

HURRRYYY UP Compare the initial values and the rates of change for Jenna's and Finn's plans. What do they mean in the problem situations?

Konu

Mathematics, 11.03.2021 19:30

100 points for this pls ...

Konu

Mathematics, 11.03.2021 19:30

Find the area of the following shape pls show your steps options:A. 298.2B. 294.3c. 268.1D. 289.5

Konu

Mathematics, 11.03.2021 19:30

Which inequality does the graph below represent? (A.2H)...

Konu

Social Studies, 11.03.2021 19:30

The Cherokee tribe had grown strong and powerful without the use of writing-- why did they need it now...

Konu

Mathematics, 11.03.2021 19:30

(3x^2 + 3x + 3) - (x^2 + 2x + 3) =...

Konu

Mathematics, 11.03.2021 19:30

Can someone help me please ...

Konu

Mathematics, 11.03.2021 19:30

- Given HJK = TRS, find the values of x and y....

Konu

Social Studies, 11.03.2021 19:30

Hurry! Only 5 minutes to answer! True or False: Congress removed part of the original Decalaration of Independence, penned by Thomas Jefferson, because they did not want slavery m...

Other tasks in the category: Chemistry More task