It acts as a filter to prevent as much germs, or chemicals/substances, as possible from entering your immune system through your breathing. This is whether you're in a lab or in a grocery store with a pandemic going around. Not only does it protect you but it also protects those around you by filtering any germs you may already have in your system and preventing them from passing on to another person. That is why you should always wear your mask over your mouth <em>and</em> your nose.
Explanation:
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Masks are important not only to keep you safe from the current pandemic but In labs to keep you safe from getting sick or inhaling any dangerous chemicals.
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HA ⇄ H⁺ + A⁻ so: and now: = 1.5 x 10⁻⁵ x is considered very small compared to 0.15 x² = 2.25 x 10⁻⁶ x = 1.5 x 10⁻³ So [H⁺] = 1.5 x 10⁻³ pH = - log [H⁺] = - log (1.5 x 10⁻³) = 2.83
![\frac{[H^+][A^-]}{[HA]} = 1.5 x 10^{-5}](https://tex.z-dn.net/?f=%20%5Cfrac%7B%5BH%5E%2B%5D%5BA%5E-%5D%7D%7B%5BHA%5D%7D%20%3D%201.5%20x%2010%5E%7B-5%7D%20%20)
= 1.5 x 10⁻⁵