Chem 12 Unit 4 Acids Bases

This is the timeline that Mrs. Toombs followed in 2020…

So please ignore the DATES!

Thurs Feb 6 and Mon Feb 10:  Introduction to Acids and Bases and pH:   Unit 4 notes part one.

VIDEO TUTORIAL

Tues Feb 18:   Conjugate acid -base pairs, Anhydrides, Strong vs. Concentrated and Weak vs. Dilute, Arrhenius Neutralization reactions:  Unit 4 notes part 2

VIDEO TUTORIAL

Thurs Feb 20 and Mon Feb 24:  We find our way back to K calcs: Working through notes package #3:  Explaining the strength of Oxyacids and Doing sample Sample Ka Calcs.  All sample questions and explanations will be done in full on the front white board.

Unit 4 notes part 3 Ka   with theUnit 4 notes part 3 Ka include sample calc answers

There will be a QUIZ on Arrhenius Neutralization equations (worksheet 4.2), and two types of Ka Calc questions (worksheet 4.3) and Acid-Acid competition questions as they relate to Bronsted-Lowry Conjugate pairs (worksheet 4.4),  on Friday Feb 28 (Term 3 mark).

Wed Feb 26:  Click here to see  VALIDATING THE ASSUMPTION   that [HA] – x = [HA]  (that is, that the subtraction of x will not change our denominator)  

We will spend a few minutes looking some particular mathematics behind the Ka Calculation, and associating it with polyprotic acids: Unit 4 notes part 4 This notes package is a proof of why we dissociate acids with a single proton each time…you are not responsible for reproducing anything in this notes package except take note of the special case of sulphuric acid dissociation!

Ka calculations for KNOWN (IDENTIFIED) acids:

How to calculate the Ka for an UNKNOWN (UNidentified) acid:

Fri Feb 28:  After the quiz,   we will begin the KaKb = Kw and HYDROLYSIS notes:

Unit 4 notes part 5 2020

It will take us 5 + classes (Fri Feb 28 to Wed March 11) to make our way through the complex concept of SALT HYDROLYSIS.

We will do a lab activity to put it all into context on Monday March 9 (no lab write-up, but valuable information can be gleaned from the activity).

Hydrolysis Lab

Wednesday March 11: Entire class to work through the Hydrolysis worksheet on the back page of the Ka Kb Kw notes package.

Friday March 13:   Just for FUN!  Acids and Bases activity.

AFTER MARCH BREAK:

CHEMISTRY 12 Data booklet

Are you just ITCHING to get back to a learning routine?

If so, the most relevant content for you right now is to review the following:

Unit 4 notes part 5 2020 – especially the worksheet on the last page

Hydrolysis Lab – treat this like a review worksheet.

We will be using the Microsoft Teams Platform, along with this blog page.

Take some time to familiarize yourself with the following:

Guide for Students Access to SD44 email

Quick Guide for Students for Microsoft Teams

Student Guide to Installing Office 365 and Microsoft Teams on your home computer

CHEMISTRY 12 April 2020

Hello!  It is so good to be back in the learning environment with you!

For now, you should know that the work we will cover, starting this week, is all essential content and the topics we will explore for the remainder of this Acid-Base unit are really relevant to everyday life, AS WELL AS being helpful with Biology concepts.

There will be many opportunities here to connect what we are learning to the bigger picture of life.

I also want to ensure that you get some exposure to  Acid-Base Titration laboratory skills  and calculations  (even if it is all online) that I know some of you will be needing for Post-Secondary Chemistry studies.

What about our Ka Quiz marks that were completed right before the March break?

As soon as I figure out, how to tell you your marks, I will communicate that to you.

First, a little overview:

Before the March Break, we had spent 3 weeks learning the complicated concept of HYDROLYSIS.

This general term haves us ask the questions:  What is this chemical? What will the reaction with Water look like? (Or will the hydrolysis reaction with water even occur…?) How will this affect the final pH?

We will start by reviewing this concept and seeing how much you can remember about determining the acidic or basic behaviour of different compounds / ions.

After this, we will take a look at the topic of Acid Rain, Ocean Acidification, and Environmental impacts.  There are MANY opportunities here to take a look at the effect of human action  (or a sudden lack thereof in light of Covid-19) on air pollution and the pH of bodies of water. We can assess data (and the validity of this data) and talk about what this could mean, looking forward into the future.

What you will need:

Monday April 6: 

WE WILL START WITH Comprehensive review of the Unit 4 HYDROLYSIS content. This will be an in depth review of everything we learned for the 3 weeks before March Break.

HYDROLYSIS CONCEPT REVIEW to ensure that everyone is aware of the complexities of Acid and Base ionization and salt hydrolysis.

CONNECTIONS TO THE REAL WORLD AROUND US:   Review these two handouts.  Can you connect these concepts to what we are currently seeing in the world / environment in light the COVID-19 Pandemic?

Also, check out these current articles. How can we ascertain the validity of “news” articles like this that we see posted online?

We will do a Microsoft teams trial run, of anyone who is interested in testing it out, on Wednesday April 8:

9:30 am – 10:00 or  2:00 to 2:30

You may attend any time that works for you. If you aren’t ready to do this yet, no worries, we will try it again next week.

On Wednesday, we will try out Microsoft teams to say HI! We can also talk about (video or typed chat) some things that are preventing you from knowing what to do with the HYDROLYSIS CONCEPT REVIEW CHART.

 

ANSWER KEY (in video form) of the HYDROLYSIS CONCEPT REVIEW 

There are 11 videos here (plus an extra enrichment video) to guide you though the HYDROLYSIS REVIEW.

HYDROLYSIS:  pH of strong acids

 

HYDROLYSIS:  pH of weak acids

 

HYDROLYSIS: pH of polyprotic acids (sulphuric acid)

HYDROLYSIS: more details on when to do multi-stage calculations to find pH of polyprotic acids

Want an even more detailed explanation of when to do multi-stage calculations to find pH of polyprotic acids? – here is a lengthy video explaining it fully (AP / UNIV)

 

HYDROLYSIS: pH of Strong and Weak Arrhenius Bases

 

HYDROLYSIS pH of Anhydrides

 

HYDROLYSIS (or not!) of Neutral Salts

 

HYDROLYSIS of Salt Solutions

 

HYDROLYSIS pH of solutions using Ka vs. Kb

 

HYDROLYSIS of salts containing the Bisulphate ion

 

HYDROLYSIS of (salt) solutions containing amphiprotic ions (HA-)

 

Please review the HYDROLYSIS CONCEPT REVIEW .

There are 11 new videos posted above, that guide you through that review worksheet.

This is a screen shot of what I looked like when I worked through this handout in class last year, on the front board.

 

 WATER: Lemon, Alkaline and Black.  

CHEMISTRY 12 December 15 and 16, 2021

The concept of BUFFERS starting with this VIDEO that serves as the INSTRUCTION for the topic of BUFFERS:

You WILL want to watch this 17 minute buffer video more than once to ensure that you fully understand the concepts.  When he asks you to pause and answer the question, please try it!

At this point in Unit 4, you should understand absolutely every concept referred to in this M.I.T. video.  If not, you do not have a full understanding of some key concepts in Unit 4.

 

This notes package is supplementary material, if you would like printed notes on the topic: Unit 4 notes part 7 buffers with full answers 2020

 notes package:  Ch 12 U 4 notes package Indicators, Titrations 2020

 

Another great resource:

This 8.5 minute video does a very good job of explaining Ocean acidification (with respect to Buffers), what the components of a Buffer are, Titrations, the pH at the endpoint of different types of acid-base reactions, equivalence points, and how to explain each separate segment of a Titration curve.

https://youtu.be/Fu5Z9AQW-kM

NOTE! At 7:30 she starts talking about different types of Titrations. This is related to REDOX Chemistry (unit 5) and NOT to acid-base reactions. Don’t confuse yourself. This is NOT the topic we are currently studying.