Calcium In Hard Water-10

Question 1

Knowing the amount of EDTA present when the color change occurs along with the molarity of the EDTA solution, we can calculate the number of moles of EDTA used.

Answer 1

True

Question 2

What is the role of a buffer in the determination of how much calcium is in a hard water sample?

Answer 2

To keep the pH of the solution within a certain range

Question 3

A student wants to determine if a sample of tap water contains Mg(+2). Which of the following pieces of information are not needed to do a titration?

Answer 3

The density of magnesium

Question 4

Once we know the amount of EDTA present when the color change occurs, we can determine the concentration of calcium present in the tapwater by converting the volume of EDTA to—

Answer 4

Moles and then take that number and divided by the initial volume of tapwater in liters

Question 5

Hard water is different from distilled water because it has anions such as Ca(+2) or Mg(+2)

Answer 5

False

Question 6

EDTA can be used to determine if a water sample is hard because ______.

Answer 6

It binds to calcium in a 1:1 ratio