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stira [4]
3 years ago
13

Is this statement true or false?

Chemistry
1 answer:
In-s [12.5K]3 years ago
7 0

Answer:

true

Explanation:

we have many sattelites that are seen by many astounouts in space by telescope but more than half space is not discoverd

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When a 18.0 mL sample of a 0.308 M aqueous hydrofluoric acid solution is titrated with a 0.361 M aqueous sodium hydroxide soluti
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pH = 12.8

Explanation:

HF + NaOH → F⁻ + Na⁺ + H₂O

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<em />

Initial moles of HF and NaOH are:

HF = 0.018L × (0.308mol / L) = 5.544x10⁻³mol HF

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2.759x10⁻³moles NaOH / 0.0410L = 0.0673M = [OH⁻]

pOH = - log [OH⁻] = 1.17

As pH = 14 - pOH

<em>pH = 12.8</em>

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