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4 years ago

Which is not a weak acid? choose one answer. a. hcl b. hf c. hno2 d. h3po4?

1 answer:

6 0

Hello!

From this list, a) HCl is not a weak acid.

Hydrochloric Acid, or HCl, is one of the most common examples of a strong acid. Strong acids dissociate completely in water to generate H⁺ and A⁻ ions. For HCl this reaction is as follows:

HCl → H⁺ + Cl⁻

Being more precise, for an acid to be called strong it needs to be stronger than hydronium ion (H₃O⁺) pKa < -1.74.

Have a nice day!

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3 years ago

A 1.000 g sample of an unknown hydrate of cobalt chloride is gently dehydrated. The resulting mass is 0.546 g. The cobalt is iso

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Answer:

Explanation:

From the 1 g sample you have:

0.546 grams of cobalt chloride

1-0.546=0.454 grams of water

Now:

1) The salt

Of the 0.546 g, 0.248 g are cobalt (Mr=58.9) and the rest id Cl (Mr=35.45):

$n_{Co}=\frac{0.248 g}{58.9 g/mol}=4.21*10^{-3}mol$

$n_{Cl}=\frac{0.298 g}{35.45g/mol}=8.4*10^{-3}mol$

Dividing:

$\frac{n_{Cl}}{n_{Co}}=\frac{8.4*10^{-3}mol}{4.21*10^{-3}mol}=2$

So the molecular formula will be:

$CoCl_2$

2) The water

The water's molecular weight is M=18 :

$n_{w}=\frac{0.454g}{18g/mol}=0.025 mol$

Bonding with the Co:

$\frac{n_{w}}{n_{Co}}=\frac{0.025mol}{4.21*10^{-3}mol}=6$

The complete formula of the hydrate:

$CoCl_2*6 H_2O$

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4 years ago

How many moles are in 38 grams of Argon? Round to 2 decimal places. Use "e" for exponents

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Explanation:

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