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Alla [95]
4 years ago
9

Which indicator will be the same color in hydrochloric acid as it is in pure water?

Chemistry
1 answer:
djverab [1.8K]4 years ago
3 0
Phenolphthalein
In acid it is colourless and in water also colourless
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Which statement best applies collision theory to preventing a dangerous reaction from occurring?
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A sample of unknown hydrate, AC-XH20, has a mass of 1.000 g before heating and a
KIM [24]

Answer:

The water of crystallization for the formula of the unknown  hydrate is 2.

Explanation:

Mass of an unknown hydrate = 1.000 g

Molar mass of hydrate = 195.5 g/mol

MOles of unknown hydrate =\frac{1.000 g}{195.5 g/mol}=0.00512 mol

Mass of hydrate after heating = 0.781 g

Mass of water lost due to heating = x

1.000 g = 0.781 g + x\\x = 1.000 g - 0.781 g = 0.219 g

Moles of water lost =\frac{0.219 g}{18.01528 g/mol}=0.0122 mol

AC.xH_2O+Heat\rightarrow AC+xH_2O

1 Mole of hydrate has x moles of water and 0.00512 moles of hydrate has 0.0122 moles of water then we can write:

\frac{1 }{x}=\frac{0.00512 }{0.0122 }\\x\approx 2

The water of crystallization for the formula of the unknown  hydrate is 2.

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