Answer:
If you contact water with a gas at a certain temperature and (partial) pressure, the concentration of the gas in the water will reach an equilibrium ('saturation') according to Henry's law.
Explanation:
This means: if you increase the pressure (e.g. by keeping the vial closed), the CO2 concentration will increase. So it simply depends what concentration you need for your assay: 'CO2-saturated' water at low pressure or 'CO2-saturated' water at high pressure.
I think the slant would be called the tilt
Answer:
Just add a plenty of dots in the first one and very few dots in the second one
Either covalent or ionic... they are nonmetals meaning that the are a component in both types of compounds