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The diagrams shown here represent solutions containing a weak acid $\mathrm{HA}\left(\mathrm{p} K_{\mathrm{a}}=5.00\right)$ and its sodium salt NaA. (1) Calculate the pH of the solutions. (2) What is the pH after the addition of 0.1 mol $\mathrm{H}^{+}$ ions to solution (a)? (3) What is the pH after the addition of $0.1 \mathrm{mol} \mathrm{OH}^{-}$ ions to solution (d)? Treat each sphere as 0.1 mol.

(1) $(a): 5.10 .(b): 4.82$ (c): $5.22 .(d): 5.00 .(2) 4.90 .(3) 5.22$

Chemistry 102

Chapter 16

Acid-Base Equilibria and Solubility Equilibria

Acid-Base Equilibria

Aqueous Equilibria

University of Maryland - University College

University of Kentucky

Brown University

Lectures

00:41

In chemistry, an ion is an atom or molecule that has a non-zero net electric charge. The name was coined by John Dalton for ions in 1808, and later expanded to include molecules in 1834.

24:14

In chemistry, a buffer is a solution that resists changes in pH. Buffers are used to maintain a stable pH in a solution. Buffers are solutions of a weak acid and its conjugate base or a weak base and its conjugate acid, usually in the form of a salt of the conjugate base or acid. Buffers have the property that a small change in the amount of strong acid or strong base added to them results in a much larger change in pH. The resistance of a buffer solution to pH change is due to the fact that the process of adding acid or base to the solution is slow compared to the rate at which the pH changes. In addition to this buffering action, the inclusion of the conjugate base or acid also slows the process of pH change by the mechanism of the Henderson–Hasselbalch equation. Buffers are most commonly found in aqueous solutions.

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The diagrams shown here re…

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hi agreement. So in order to tackle this question, which people? You should know what they have given in each case. Okay, so first, a raider given data. So, you know, in there are full diagrams, ABC Bank de Diagram. Now, in all cases, they're given the spares, so they have given concentration of action E. So in first case, consolation of pages buying forward on a minus is playing for you in second case 0.6. And this is playing for the entire case. It is buying three on point fighter. Every spare is equal 2.1. This is fine full, and this is again point for, So first will calculate the pH off E S o P h can be calculated by using. Henderson has self village situation. P H is equal to pick a plus. Log off concentration off a minus upon concentration off Shea to the best plan that is equal to, you know, PK the provided. So be a they provided as for you and v h here to calculate. So the case for you plus log off concentration All a minus in first cases 0.5 divided by 0.4. That is for you less log off 1.2 for you to the west 10 and that is equal to fire You plus 0.97 and therefore P H is equal to 40 point, not 97. There is a conduct 5.10 So this is what you are. Answer. Then we'll go for a second case. That is, you can say be case seeking case in big case. Once again, pH is he called Toe K plus Lago waiting for derided by 0.6 to the base camp. So the case for you bless log off wind 66 to the best. And so that is equal do for U minus waned 17 39 to file. So this is equal to 4.18. Yeah. The next seat comes The edge right is equal to P. K plus log up 0.5. You are hereby 0.3. That is equal toe file plus log to the best 10 off 1.67 That is equal to file plus 0.2 to 1 end. And therefore P H is equal to 5.2 to 1 a. The next. Be there it is. Ph is he can do, he can less log off consolation off a minus upon constitutional page. So that is equal to file. Plus log off 14 or 1.4 to the way spend So pH in this case is called to fight bliss Zero. That is a call to five. Wow, The next case, second case dimension, That is the air 0.1 more off age plus of bed origen off when one mold I see are entering So in a p h is equal to he que let's log of consolation of entry a bond consummation of PE minus the ideal by consideration of page to the West. And so the case five plus log off a minus. It is, you know, buying four. There are river. This is fine for you. So enough for you less log up minded. So that is equal to for U minus when not 969 So that is equal to 4.90 than the last third. You know, once again, pH is equal to pick a less log off consideration off a minus upon consolation off HK to the very stank. So there is equal to fire. Yeah, less logo point for you that remains is buying for you like Trump. One more off trees. Ohh is a red, so it would look on point. So that is equal to for you. Plus Lago 0.67 1.67 So that is equal to so long. Up 1.6 seventies Log off 26 7 to the veg Tiny's Okay, point repelled. 271 That side is five point Do do seven. Thanks.

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