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W&WW quiz 3
q & a for quiz 3
18
Civil Engineering
Undergraduate 4
04/30/2012

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Cards

Term
The two major cations that cause hardness are...
Definition
magnesium and calcium
Term
The name of the colorimetric test that measures hardness is called the _____ method.
Definition
EDTA
Term
The name of the color indicator used in the hardness test is...
Definition
eriochrome black T
Term
The color change in the hardness test is from red to ...
Definition
blue.
Term
When the hardness equals the alkalinity, the the type of hardness is called...
Definition
carbonate hardness
Term
The protion of hardness that exceeds the alkalinity is called ....
Definition
non-carbonate hardness
Term
The hardness that is removed by boiling is called...
Definition
temporary hardness
Term
The hardness that is not removed by boiling is called...
Definition
permanent hardness
Term
The ion that caused pseudo-hardness is...
Definition
sodium
Term
The amount of chloride added by sewage to the carrier water is...
Definition
15 mg/L
Term
How many grams of chlorides per day are added by urine to sewage?
Definition
6 g/day
Term
The two methods of analysis for chlorides are the...
Definition
Mohr method and the Mercuric Nitrate method
Term
What is the recommended US public health limit for chlorides in drinking water?
Definition
250 mg/L
Term
Chlorides and _____ tests have been used to detect sewage contamination.
Definition
nitrogen
Term
Hardness in water is  health concern in drinking water.
Definition
Flase
Term
Hardness in water causes hot water heaters to last longer.
Definition
False
Term
Hardness in water causes more soap consumption.
Definition
True
Term
Very soft water is preferable because it is likely more healthy than hard water.
Definition
False
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