Explore
For Enterprise
Join for Free
Log In

艺术与人文
商务
计算机科学
数据科学
信息技术
健康
数学和逻辑
个人发展
物理科学与工程
社会科学
语言学习
学位
证书

浏览 Coursera 的全部课程

浏览
搜索
企业版
登录
免费加入

4.06 Part 1 Aqueous Equilibria Worked Example

Loading...

高级化学

肯塔基大学

4.7（422 个评分） | 50K 名学生已注册

A chemistry course to cover selected topics covered in advanced high school chemistry courses, correlating to the standard topics as established by the American Chemical Society. Prerequisites: Students should have a background in basic chemistry including nomenclature, reactions, stoichiometry, molarity and thermochemistry.

查看授课大纲

审阅

4.7（422 个评分）

5 stars
315 ratings
4 stars
85 ratings
3 stars
16 ratings
2 stars
4 ratings
1 star
2 ratings

KO

Jul 17, 2017

Excellent content and delivery!\n\nThis course has many well-explained examples and practice questions to reinforce the understanding of the taught concepts. Thank you!

CW

Sep 17, 2015

I used this course as a significant portion of my preparation for the CLEP Chemistry exam, and passed today with an A! Thank you!

从本节课中

Aqueous Equilibria

This unit continues and expands on the theme of equlibria. You will examine buffers, acid/base titrations and the equilibria of insoluble salts.

4.01 Buffers and the Common Ion Effect10:01

4.02 pH of Buffer Solutions14:04

4.02a Aqueous Equilibria Worked Example 13:58

4.03 Buffer Action25:21

4.03a Aqueous Equilibria Worked Example 25:22

4.03b Aqueous Equilibria Worked Example 35:11

4.04 Buffer: Preparation and Capacity8:45

4.05 Strong Acid - Strong Base Titration17:20

4.06 Titrations Involving Either a Weak Acid or a Weak Base36:45

4.06 Part 1 Aqueous Equilibria Worked Example3:46

4.06 Part 1.a - Aqueous Equilibria Worked Example4:06

4.06 Part 1.b - Aqueous Equilibria Worked Example4:55

4.06 Part 1.c - Aqueous Equilibria Worked Example4:21

4.06 Part 1.f Aqueous Equilibria Worked Example8:01

4.06 Part 1.h Aqueous Equilibria Worked Example3:57

4.06 Part 2.a Aqueous Equilibria Worked Example8:25

4.06 Part 2.b Aqueous Equilibria Worked Example5:53

4.07 Polyprotic Acid Titrations5:53

4.08 Indicators10:19

4.09 Solubility Equilibria4:50

4.10 Molar Solubility and the Solubility Product10:37

4.10.a Aqueous Equilibria Worked Example2:20

4.11 Molar Solubility and the Common Ion Effect7:20

4.11 2.b - Aqueous Equilibria Worked Example4:42

4.11 2.c Aqueous Equilibria Worked Example3:45

4.12 The Effect of pH on Solubility7:07

4.12.b Aqueous Equilibria Worked Example3:42

4.12c Aqueous Equilibria Worked Example3:30

4.13 Precipitation Reaction and Selective Precipitation15:03

4.13a Aqueous Equilibria Worked Example9:05

教学方

Dr. Allison Soult
Lecturer
Dr. Kim Woodrum
Sr. Lecturer

脚本

going to be doing several calculations for this learning objective.

Lot of practice or calculating the pH.

Along a titration curve when you have, in this case,

a weak acid and then a strong base.

The process is very similar if it was a strong acid and a weak base but

we're going to see it here at various points.

The purpose of this video is to give you an overview of all the different processes

and to think about how the calculations are different at each point along the way.

Let's kind of get a vision in our mind of what's going on.

We've got a flask and in this flask is our butanoic acid which is a weak acid.

And we are going to be titrating it with sodium hydroxide.

So we have got a burette with a little stopcock here, and

in this burette is sodium hydroxide.

And we're going to be adding that sodium hydroxide drip by drip into this, and

seeing how the pH changes along the way.

Now at the very beginning, at point (a),

we only have the weak acid, all right?

So we only have the weak acid present in solution at point (a).

So we would work the problem very similar

to how you saw problems worked in the previous unit on acid base equilibrium.

At point (b) we're at 10 mL, so that's here.

At point (c) we're at 15 mL, so right here.

So here's (b) and here's (c).

And at those points we are in buffer range.

And we can work the problem as a buffer solution.

At point (d) and (e), we're fast approaching the equivalence point, so

we're at 19 mL and 20 mL, we're really close, (d) and

(e) to the equivalence point, but we haven't reached it yet.

We are not going to do the calculation for (d) and (e).

Because there's some complications that we would have to consider

that I do not want to get into in our units here.

At point (f), we have added exactly the right amount sort of concentrations

of butanoic gas, we see right up here, and the sodium hydroxide as the same.

Then we're at the same volume of base that we had of s,

it will be at the equivalence point.

So part (f) is at the equivalence point.

(g), we've just barely gone beyond the equivalence point.

And at point (h) we're up here at 25 mL, so here's point (h).

At point (h) we have excess, Sodium hydroxide,

we have gone beyond the equivalence point.

We've converted all of the weak acid to the conjugate base, and

we also have some extra base left over.

We'll get to base the problem strictly upon the amount

of hydroxide due to the strong base at this point.

So we've got several different types of problems will have to work,

at the beginning it's just weak acid.

Here is this zone we have a buffer and we'll work a buffer.

A point f we're at the equivalent point and we have converted all the weak acid to

it's conjugate base, which is weak, and we will be doing it at weak base problem.

And then we will be beyond the equivalent point and have extra strong base.

So as you work through that, be thinking about how each part along the titration

curve is a different type of reaction.

And that's what's really challenging for students often is to see the different

ways you work the problem depending upon where you are in the titration curve.

探索我们的目录

免费加入并获得个性化推荐、更新和优惠。

Coursera 致力于普及全世界最好的教育，它与全球一流大学和机构合作提供在线课程。

© 2019 Coursera Inc. 保留所有权利。

通过 App Store 下载

通过 Google Play 获取

Coursera
关于
管理团队
工作机会
目录
证书
MasterTrack™ 证书
学位
企业版
政府版

社区
Learners
Partners
Developers
Beta Testers
Translators

连接
博客
Facebook
领英
Twitter
Instagram
YouTube
技术博客

更多
条款
隐私
帮助
内容访问
媒体
联系我们
目录
附属公司