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3 years ago

What is the charge of a hypothetical ion with 85 protons and 87 electrons?

1 answer:

3 0

There is a charge of -2 on an ion.
A neutral atom always have equal number of protons and electrons. if an atom loses and electron, an ion gets positive charge and if an atom gains electron it gets negative charge.
An atom with 85 protons means it also have 85 electrons but when it gains two electrons it becomes ion and then the number of electrons is 87. So that is why an ion have -2 charge.

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babymother [125]

Answer:

16.56 g

Explanation:

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3 years ago

If 40.0 mL of a calcium nitrate solution reacts with excess potassium carbonate to yield 0.524 grams of a precipitate, what is t

tankabanditka [31]

Answer : The molarity of calcium ion on the original solution is, 0.131 M

Explanation :

The balanced chemical reaction is:

$Ca(NO_3)_2+K_2CO_3\rightarrow CaCO_3+3KNO_3$

When calcium nitrate react with potassium carbonate to give calcium carbonate as a precipitate and potassium nitrate.

First we have to calculate the moles of $CaCO_3$

$\text{Moles of }CaCO_3=\frac{\text{Mass of }CaCO_3}{\text{Molar mass of }CaCO_3}$

Given:

Mass of $CaCO_3$ = 0.524 g

Molar mass of $CaCO_3$ = 100 g/mol

$\text{Moles of }CaCO_3=\frac{0.524}{100g/mol}=0.00524mol$

Now we have to calculate the concentration of $CaCO_3$

$\text{Concentration of }CaCO_3=\frac{\text{Moles of }CaCO_3}{\text{Volume of solution}}=\frac{0.00524mol}{0.040L}=0.131M$

Now we have to calculate the concentration of calcium ion.

As, calcium carbonate dissociate to give calcium ion and carbonate ion.

$CaCO_3\rightarrow Ca^{2+}+CO_3^{2-}$

So,

Concentration of calcium ion = Concentration of $CaCO_3$ = 0.131 M

Thus, the concentration or molarity of calcium ion on the original solution is, 0.131 M

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3 years ago

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Answer: option A.

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Answer:

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2 years ago

How do atoms and molecules of elements and compounds combine in chemical reactions?

solong [7]

Answer:

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2 years ago

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