acids/bases

Acid, Base, pH and Food Chemistry

Chad Husting | Fri, 06/09/2017 - 06:58

I try to examine activities an multiple levels. First on the list, I want to know if my students will be engaged and learn something. Second, how difficult is it for me as a teacher to actually pull it off? One of the most important questions...are the students learning chemistry or just having fun? This is the first year I have attempted the following activity. tudents were engaged in the real world connection, they asked questions, it transitioned into some chemistry concepts and even some parents got involved. The activity involved acid, bases, pH and food.

Time required:

An evening of baking (about an hour at home) and a day in class.

Reduction of Permanganate Ion by Acids in Rhubarb, Apples, and Candy

Tom Kuntzleman | Mon, 06/05/2017 - 17:00

If rhubarb stem is placed in a solution of permanganate, the purple permanganate ion is reduced to the colorless Mn²⁺ ion. It is thought that the oxalic acid present in rhubarb causes this reduction. The investigations presented in this post provide evidence that this may not be the whole story...

Titrations and Microscale Chemistry

Chad Husting | Sun, 05/21/2017 - 13:42

I tend to enjoy acid base titrations for several reasons. First, students get to work with burettes, acids, bases and they see a nice "color change" when they reach an endpoint. Many times, students who tend to struggle with pen and paper testing excel at the "hands-on" approach. Titrations also dovetail well with stoichiometry which provides a nice review of information closer to the end of the year.

JCE 94.05 May 2017 Issue Highlights

Mary Saecker | Wed, 05/10/2017 - 14:32

Journal of Chemical Education May 2017 Cover

Lasting Value and High Impact

The May 2017 issue of the Journal of Chemical Education is now available online to subscribers. Topics featured in this issue include: project- and inquiry-based laboratories; measuring value and impact; research on core ideas and clickers; new twists on classic activities; understanding diffraction; acid-base chemistry; teaching informed by technology: flipped learning, biochemistry labs, and scientific computing for chemists; from the archives: chemistry helps feed the world.

Using Visual BCA Tables to Teach Limiting Reactants

Melissa Hemling | Wed, 04/26/2017 - 11:10

A few months ago I was searching the internet, looking for a better way to teach stoichiometry to my pre-AP chemistry students. While my methods of dimensional analysis “got the job done” for most students, I would still always lose students and many lacked true understanding of what was happening in the reaction. I wanted to try something new that would promote a better chemical understanding. In my search for this elusive stoichiometry method, I came across Dena Leggett’s ChemEd X blog post entitled “Doc Save Everyone”, as well as other posts about BCA tables from Lauren Stewart, Lowell Thomson, and Larry Dukerich.

Do you have a favorite acid-base titration lab?

Allison Tarvin | Sat, 03/11/2017 - 10:11

HCl and NaOH, a strong acid - strong base titration? Citric acid and NaOH, a weak, triprotic acid - strong base titration? Do your students standardize the NaOH solution as a first step?

JCE 93.10 October 2016 Issue Highlights

Mary Saecker | Tue, 10/11/2016 - 12:38

Journal of Chemical Education October 2016

The October 2016 issue of the Journal of Chemical Education is now available online to subscribers. Topics featured in this issue include: exploring the candy–cola soda geyser; peer-led team teaching; investigating students’ reasoning; fostering a student-centered learning environment; chemical education in India; activities to increase interest in chemistry; using a smartphone in the laboratory; food chemistry analysis; organic synthesis; green chemistry in the organic laboratory; materials science experiments; cost-effective laboratory equipment; teaching resources; JCE resources to celebrate National Chemistry Week 2016.

Real World Application: Drain Cleaners - Should I use them?

MeyersChemistry | Fri, 10/16/2015 - 15:01

Common drain cleaners consist of water, sodium hypochlorite (bleach) and sodium hydroxide (base) and/or potassium hydroxide (base). Bases are caustic (caustic loosely means to gnaw or eat away at) and can cause corrosion in metal pipes. Wouldn’t you know, our house has PVC piping through the fixtures that dump into a 45 year old cast iron pipe. The cast iron pipe is old and currently shows signs of surface rust and corrosion to the point where the pipe appears to be leaking then sealing itself in several spots. Not to mention the interior of the cast iron pipe may not be completely open, thus, not permitting a fast flow in drainage. Good news: a home warranty is being taken advantage of to hopefully replace the cast iron pipe with a PVC pipe.

Wash Your Blues Away - With Chemistry!

Tom Kuntzleman | Thu, 09/03/2015 - 18:31

How does the blue to white color change occur in the foam of Scrubbing Bubbles or KABOOM Brand cleaners? Watch this video and find out.

My First Day Demonstration

Michael A. Morgan | Fri, 07/31/2015 - 19:23

I have a first day routine that I am very proud of. I have used it for 25 years and I think I finally have it down pat. I have spoken to students from 20 years ago at reunions and they tell me that they still remember the first day of chemistry so I think it is pretty good.