Check out this article from CNN which explains how this innovative design and application of science is helping out the water shortage in Ethiopia.:
pH: Definition: pH is a measure of hydrogen ion concentration; a measure of the acidity or alkalinity of asolution. Aqueous solutions at 25°C with a pH less than seven are acidic, while those with a pH greater than seven are basic or alkaline. A pH level of is 7.0 at 25°C is defined as ‘neutral‘ because the concentration of H3O+ equals the concentration of OH− in pure water. (taken from About.com Chemistry)
In order to begin with pH Levels we will first watch this video.
Extension: Here are some additional sites with more information about pH:
- USGS Water Science School
- Here is another interactive site if you want to further your knowledge and test your skills.
- Article from Oceanus Magazine about pH of oceans
Now that you have learned about Density, Boiling Point and Solubility, you will now have a chance to apply your knowledge and skills to a Water Analysis.
To begin today, we are going to revisit what we started with in this unit…a video on Why Water?
After, I am going to have you partner(or triple) read this article about Hong Kong’s water situation.
We will then come together and brainstorm a list of potential pollutants and sources of those pollutants in water around the world. As your team does this, please list them on your sheet of paper. You will be rotating from group to group adding on to each paper.
In preparation of looking at samples of water next week, we will conclude by watching this video on the PH of different liquids.
This assessment is only covering the Solubility and Mixtures part of our Properties of Matter Unit. First and foremost, check over all of the information that you have already done on your labs. Another GREAT way to study is to go over your ‘Scrapbook”. All of your learning from this unit should be in there. This was part of the purpose of this for REVIEW!
We will do a review in class on Monday March 24th in preparation for the test on Tuesday. See me earlier if you don’t understand something!
The vocabulary for this section is:
- saturated solution
- separation techniques – know what we have done in class: sieve, funnel and filter, chromatography, magnets, heating and evaporation
Other Sources to Review from:
Mixtures and Solutions Video – we watched this and took notes already (check them!)
Compounds and Mixtures – BBC interactive site
Solubility Video – you watching this, took notes and answered questions
Solubility Curves Video – watched after Solubility Labs
CK-12 Readings: (We read these at different times throughout this section0
- Mixtures and Solutions Reading and Video
- Homogeneous Mixtures
- Heterogeneous Mixtures
- Separating Mixtures
Separating Mixtures (shows different ways to do this) – BBC Bitesize