Acids and Bases
Substances with a pH of 7 are called this.
Neutral
LD50
Colder water can hold more _____________ than warm water.
oxygen
What is the best way to tell if a substance is an acid or base?
Use a pH indicator.
This type of substance often feels slippery and tastes bitter.
Base
To be harmful after repeated exposure means a substance has _____________ toxicity.
Chronic
Clear water is said to have better water quality because it has lower ____________ compared to cloudy water.
Turbidity
This type of indicator tests for the specific pH of a substance.
Universal indicator.
Potential of hydrogen
The label on a 355 ml coke can reads that there is there is 141 ppm of sodium in it. How many milligrams of sodium are in the can of coke?
50mg of sodium
This action that is commonly seen in rivers and streams where it is rocky is great for incorporating more oxygen into the water.
Turbulence
Litmus paper turns blue in this type of substance.
Base
To add equal amounts of an acid and base together is called what type of reaction.
Neutralization.
The water in a lake is contaminated. A technician takes 100 ml of the lake water and determines that the sample contains 5 ml of contaminant. Calculate the concentration of the contaminant in the water in ppm.
50 ppm
These organisms can tell you the quality of the water in an area.
Macroinvertebrates/ biological indicators.
Bromothymol blue turns yellow in this type of substance.
Acid.
A substance that contains excess hydrogen ions is...
Acidic
A 0.05 kg soil sample taken from an industrial section of town was found to contain 0.02 g of zinc. What is the ppm?
400 ppm
Run-off can impact water quality because it can take nutrients like phosphates with it causing an increase in ___________.
Algae/ algal blooms
Phenolphthalein turns what colour in an alkaline solution.
Pink