What is the law of conservation of mass?

Matter cannot be created nor destroyed, only transformed.

Why are the group 1 metals called "alkali metals"?

When reacting with water they form alkaline hydroxides

What is the electron configuration of H⁺? Of H^-?

H⁺: 1s⁰

H^-: 1s²

Define A, a, b and c in the equation A=abc.

A-absorbance

a- absorptivity constant

b- cell width

c- concentration (of absorbing species)

Of sodium, potassium, calcium, magnesium and zinc, which would you expect to react the least/littlest?

Zinc

What is the purpose of phenolphthalein?

To detect the presence of a base/low pH.

Define titration

To find the exact volume of one reagent required to exactly react with another reagent.

Define analyte

The analyzed reagent in a titration.

Define titrant

The reagent used to analyze another reagent in a titration.

Define the terms equivalence point and end point.

Equivalence point: when the number of mols of acid and base are equal

End point: When the indicator changes colour

How many Hs does a monoprotic acid have? A diprotic acid? A triprotic acid?

1,2,3

What does an equivalence point look like on a titration curve?

A very large change in pH with a relatively small change in volume.

What is the generic equation for a monoprotic acid reacting with NaOH?

HA_(aq)+ NaOH_(aq) -> NaA_(aq) + H₂O_(l)

What is the generic equation for a diprotic acid reacting with NaOH?

H₂A(aq)+ 2NaOH_(aq) -> Na₂A_(aq) + 2H₂O_(l)

What is the generic equation for a triprotic acid reacting with NaOH?

H₃A(aq)+ 2NaOH_(aq) -> Na₃A_(aq) + 3H₂O_(l)

If K_a= 10^-4.63 then how many significant figures will the K_a have?

2 (because 10^{-4. 63} only has 2 figures after the decimal point)

What is the generic equation for a triprotic acid reacting with NaOH?

H₃A(aq)+ 3NaOH_(aq) -> Na₃A_(aq) + 3H₂O_(l)

Define A, a, b and c in the equation A=abc.

A-absorbance

a- absorptivity constant

b- cell width

c- concentration (of absorbing species)

What does the symbol %T represent in the equation A=2-log %T

Percent transmittance

Why must HCl be handled with care? (2)

It can cause severe burns and respiratory irritation

How would a blank cell for spectrometry be prepared?

With the appropriate ratios of every component except the one which causes the colour you will measure.

1 ppm = 1 ___/____ What are the missing units?

1 ppm = 1 mg/L