LEARN HOW TO TELL THE DIFFERENCE BETWEEN HARD AND SOFT
WATER
INVESTIGATE THE PRESENCE OF IONS IN WATER
RESOURCES:
HEATH SCIENCE CONNECTIONS 10 PAGES 413 TO
420
INVESTIGATING AQUATIC ECOSYSTEMS PAGES 95
TO 98
EXPERIMENT:
PERFORM THE EXPERIMENT ON PAGE 413 IN YOUR HEATH SCIENCE CONNECTIONS
10 TEXTBOOK ENTITLED "WHAT CAUSES WATER HARDNESS?".
NOTE: YOU WILL HAVE TO ASK YOUR TEACHER FOR THE NECESSARY MATERIALS.
IN PARTICULAR YOU WILL NEED 8 DIFFERENT SOLUTIONS AS IS LISTED
IN THE MATERIALS SECTION ON PAGE 413.
EXPERIMENT:
WRITE A FORMAL EXPERIMENT REPORT.
ANSWER THE QUESTIONS IN THE "DISCUSSION" SECTION ON PAGE
414 OF YOUR HEATH SCIENCE CONNECTIONS 10 TEXTBOOK.
ECHO THE QUESTIONS IN EACH OF YOUR ANSWERS.
EXPERIMENT:
YOUR MARK WILL BE BASED ON YOUR FORMAL EXPERIMENT REPORT.
PRESENTATION OR LOOK OF YOUR FORMAL REPORT(10)
COMPLETENESS (10)
ACCURACY (10)
TOTAL POSSIBLE MARKS = 30 MARKS
READ AND TAKE NOTES ACTIVITY - PREPARE TO HAND IN:
1. YOUR NOTES
2. YOUR ANSWERS TO QUESTIONS 1, 3, 4, AND 5 ON PAGE 97 OF YOUR INVESTIGATING
AQUATIC ECOSYSTEMS TEXTBOOK. BE SURE TO ECHO THE QUESTION
IN YOUR ANSWER.
READ AND TAKE NOTES ACTIVITY
YOUR SCORE WILL BE BASED ON YOUR POINT FORM NOTES AND YOUR QUESTION
ANSWERS AS FOLLOWS:
NOTES COMPLETE (10)
NOTES ACCURATE (10)
QUESTIONS COMPLETE AND CORRECT (4)
PRESENTATION OF NOTES AND QUESTIONS (6)
THE TERM HARD WATER IS USED TO DESCRIBE WATER
THAT DOES NOT FORM MUCH LATHER WITH SOAP.
THE TERM SOFT WATER IS USED TO DESCRIBE WATER
THAT EASILY FORMS LATHER WITH SOAP.
IF YOU WASH YOUR CLOTHES IN HARD WATER THE SOAP
WILL FORM A GREY COLORED SCUM ON THE WATER
AND YOUR CLOTHES WILL NOT BE AS CLEAN
AS IF YOU HAD USED SOFT WATER. THE HARDER
THE WATER THE MORE SCUM THAT FORMS. ALSO
THE HARDER THE WATER THE MORE DIFFICULTY
IT IS TO GET THE SOAP TO FORM A LATHER.
LESS LATHER MEANS HARDER WATER.
HARD WATER IS CAUSED BY DISSOLVED MINERALS. SOFT
WATER CONTAINS FEW TO NO DISSOLVED MINERALS.
BUT, NOT ALL DISSOLVED MINERALS MAKE WATER
HARD. IN ORDER FOR WATER TO BE HARD, CERTAIN
DISSOLVED MINERALS MUST BE PRESENT IN
THE WATER SAMPLE.
