Lab: Testing Water for Hardness

Views:
 
Category: Education
     
 

Presentation Description

For my students who missed class the day we did the lab.

Comments

Presentation Transcript

Slide1:

Get a copy of the lab from Benson. Read the introduction. Do the pre-lab questions – See next several slides.

1. What is an “ion”?:

1. What is an “ ion ” ? An atom that has gained or lost an electron(s)

2. Which three are usually to blame if water is “hard”?:

2. Which three are usually to blame if water is “ hard ” ? Ca 2+ Fe 2+ Mg 2+

3. How do these get into surface water and groundwater?:

3. How do these get into surface water and groundwater? They dissolve from rocks, such as limestone, etc. CaCO 3 Ca 2+ CO 3 2-

4. How is distilled water different from other water?:

4. How is distilled water different from other water? It has nothing dissolved in it.

5. Why is it undesirable to have water that is TOO hard?:

5. Why is it undesirable to have water that is TOO hard? CURDS Soap scum SCALING clogs up . . . hot water heaters dishwashers coffee makers Shower heads Clothes irons HOT!

Slide8:

Scaling (lime scale) builds up inside pipes.

Slide9:

Read the lab procedures t o find out what we did.

Slide10:

Curds Suds (lather) If you can ’ t tell . . . ask Benson.

Use this data List them on data table.:

Use this data List them on data table. 1. Distilled 3 2. Davis Gulch 12 3. limestone 21 4. Eureka well* 9 5. H elena tap 6 6. Green Group 6 7. H. Valley Aquifer* 12 8. Crystal Geyser* 6 9. Denton, MT * 9 10. McCarthy well* 18 *Groundwater .

Complete the questions and then hand it in.:

Complete the questions and then hand it in.

authorStream Live Help