2 years ago

Which is a limitation of comparative investigations?

Chemistry

2 answers:

IgorC [24]2 years ago

7 0

Answer:

hi............

Explanation:

siniylev [52]2 years ago

5 0

I Hl its the third one (your welcome )

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A solution of [FeSCN]^{2+} is found to have 37% transmittance at 447 nm. If the molar absorption coefficient (ε) is 4400 at λ_{m

alexandr1967 [171]

Answer:9.81×10^-5 M

Explanation: See attachments

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3 years ago

What is an ecosystem. A.It is a single plant and a single animal that live in given area B. it is a community of plants, animals

gavmur [86]

Answer:

B. it is a community of plants,animals and there physical surrounding.

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2 years ago

How many atoms are ln 6.31 moI of sodium sulfate

Art [367]

896.27
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2 years ago

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kvasek [131]

Answer:

Explanation:

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3 years ago

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A monoprotic weak acid when dissolved in water is 0.66% dissociated and produces a solution with a pH of 3.04. Calculate the Ka

raketka [301]

Answer:

Ka = 6.02x10⁻⁶

Explanation:

The equilibrium that takes place is:

HA ⇄ H⁺ + A⁻

Ka = [H⁺][A⁻]/[HA]

We calculate [H⁺] from the pH:

pH = -log[H⁺]

[H⁺] = $10^{-pH}$

[H⁺] = 9.12x10⁻⁴ M

Keep in mind that [H⁺]=[A⁻].

As for [HA], we know the acid is 0.66% dissociated, in other words:

[HA] * 0.66/100 = [H⁺]

We calculate [HA]:

[HA] = 0.138 M

Finally we calculate the Ka:

Ka = $\frac{[9.12x10^{-4}]*[9.12x10^{-4}]}{[0.138]}$ = 6.02x10⁻⁶

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2 years ago