How should chemicals be stored?

Appropriate container as labeled

What piece of glassware would be most appropriate for the preparation of a stock standard?

Volumetric flask

What factors may influence the effectiveness of disinfection?

Turbidity, PH, contact time, organic matter, reducing agents

Chemical formula for chloroform?

CHCl3

Chemical formula for sodium bicarbonate?

NaHCO3

What is phenolphthalein?

PH indicator

Graduated cylinder would be more appropriate for?

Multiple volumetric dilutions

Total chlorine residual consists of what 2 parts?

Free chlorine and combine chlorine

What is acid is added to the sample bottle prior to sampling for iron manganese?

Nitric acid

TDS equipment needed?

Pressure/vacuum pump, drying oven for preparation at 180 +/-2C, analytical balance capable of weighing is 0.1mg, dessicator with desiccant containing color indicator of moisture concentration

What causes true color?

Dissolved organic sand minerals

What causes carbonate hardness?

Calcium/magnesium Carbonate/bicarbonate

What does TON mean?

Threshold, odor, number

Coliforms are indicators for what?

Pathogenic organisms

How long should it take the autoclave to reach a temp of 121?

5 minutes

Element Oxogen

O atomic number 16

Element Hydrogen

H atomic number 1

Element Magnesium

Mg atomic weight 24

Metals (excluding mercury and chromium) preservation and hold time?

PH<2 HNO3 6 months

Alkalinity preservation and hold time?

</= 4-6C 14 days

Preservation method and max hold time for TDS (total dissolved solids)?

</=6C 7 days

Solids (TSS, TDS, TS) preservation and hold time?

</= 6C 7 days

BOD (biochemical oxogen demand) preservation and hold time?

</= 6C 48 hours

Hold time for settleable solids analysis?

48 hours

What are used to accurately measure volumes of chemicals when titrating?

Burets (Most accurate = volumetric pipet)

Ability of aqueous solution to conduct an electric current?

Conductivity

Hold time for total dissolved solids (TDS)?

7 days

Chemical formula for Nitric acid?

HNO3

What is phenolphthalein?

PH indicator

Graduated cylinder would be more appropriate for?

multiple volumetric dilutions