Water Characteristics
The State recommends an H2S level or less than ____________.
0.05mg/L
The State requires filtered water to be equal to or less than __________ turbidity units in at least 95% of the monthly samples.
0.3 NTU or less and can never exceed 1 NTU
Water is considered hard when it exceeds _______mg/L of calcium carbonate.
100mg/L
The State reccommends a TON of _______ or less.
3
An alkaline or basic solution has a pH greater than _______.
7
Precipitation that trickles into the ground recharging __________ is called percolation.
Aquifers
Suspended solids in water cannot be filtered out. T/F
False
The terms mg/L and ppm are not interchangeable. T/F
False
The State reccommends 20 color units or less for water. T/F
False (15 color units)
The State reccommends a water pH of less than 7 at all times.
False (slightly greater- basic)
pH is the concentration of the hydrogen ion on a scale of 1 to 14. T/F
False. (0 to 14)
The State reccomends a maximum total dissolved solids content of 500mg/L. T/F
False. (1000mg/L)
The threshold odor number (TON) relates to the number of dilutions needed for the water to be tasteless. T/F
False. (odorless)
True color is dissolved in water and cannot be removed by __________
Filtration
The chemical symbol for water is _________
H20
There are 3 common gases found in water: carbon dioxide, methane and ___________.
Hydrogen sulfide.
Natures way of recycling our water is a process called the __________
Hydrologic Cycle
Water before it is treated is called _______ water.
Raw
A pH reading of 0 means this is one gram of hydrogen ions per liter of water - the theoretical maximum. T/F
True
Examples of organic matter found in water include bacteria, viruses, and protozoa. T/F
True
Taste and odor can come from organisms such as bacteria, algae, vegetation and certain chemicals and metals. T/F
True
The State recommends a H2S level of less than 0.05 mg/L T/F
True
The deeper the well, the warmer the water. T/F
True
The physical characteristics of water are color, taste, odor, temperature, and turbidity.
True
The red color caused by iron is apparent color or suspended color and it can be removed by filtration. T/F
True
There are 2 Hydrogen atoms and 1 Oxygen atom in each water molecule. T/F
True
Turbidity is the amount of suspended matter in water and causes the water to be cloudy. T/F
True
Turbidity meters used for compliance monitoring must be calibrated with primary standards at least once every 90 days. T/F
True
Turbidity must be limited because it shelters and nourishes bacteria and interferes with disinfection. T/F
True
Water from oceans, rivers, lakes and soil transfers to the atmosphere by evaporation. T/F
True
Water is called the universal solvent and is not found pure in nature. T/F
True
Water is considered hard when it exceeds 100mg/L of calcium carbonate hardness. T/F
True
Solids, water hardness, pH, and gases are _________ characteristics.
chemical
Consumers want water to be palatable _________ and have little or no odor.
good tasting
Taste, like odor, is measured by ___________ and not by ______________.
human senses, not instruments
Dissolved solids are ________ and can not be filtered out.
in solution
Excessive calcium and _________ are the primary cause of hard water.
magnesium
One part per million or 1mg/L means that for every __________ pounds of water there is 1 pound of material in it.
million
The word mineral can mean __________
not organic, AND inorganic
Water temperature affects water density, ________ content, and biological activity.
oxygen content
Safe to drink. __________
potable
When tea is dissolved in water, it is an example of ________ color.
true color
With enough heat, water and oxygen burn explosively producing __________
water.
