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IrinaK [193]
3 years ago
12

The process of _______ begins in the mouth, where for is ground into small pieces.

Chemistry
2 answers:
krek1111 [17]3 years ago
5 0
Umm... excretion sorry not sure about that one. Hope this helsp
ziro4ka [17]3 years ago
4 0
B) saliva.

excretion is waste in liquid form as in pee which does not begin in the mouth so it's wrong.
waste obviously does not begin in the mouth.
digestion begins in your stomach, not your mouth.
saliva starts in the mouth and then processes on. So saliva is correct
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Answer:

pH = 12.15

Explanation:

To determine the pH of the HCl and KOH mixture, we need to know that the reaction is  a neutralization type.

HCl  +  KOH  →  H₂O  +  KCl

We need to determine the moles of each compound

M = mmol / V (mL) → 30 mL . 0.10 M = 3 mmoles of HCl

M = mmol / V (mL) → 40 mL . 0.10 M = 4 mmoles of KOH

The base is in excess, so the HCl will completely react and we would produce the same mmoles of KCl

HCl  +  KOH  →  H₂O  +  KCl

3 m       4 m                       -

             1 m                      3 m

As the KCl is a neutral salt, it does not have any effect on the pH, so the pH will be affected, by the strong base.

1 mmol of KOH has 1 mmol of OH⁻, so the [OH⁻] will be 1 mmol / Tot volume

[OH⁻] 1 mmol / 70 mL = 0.014285 M

- log [OH⁻] = 1.85 → pH = 14 - pOH → 14 - 1.85 = 12.15

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