Chemistry, 04.09.2019 22:30 Bowied6025

Question 22 write the empirical formula for at least four ionic compounds that could be formed from the following ions:
(a) po4^3-,
(b) nh4^+,
(c) fe^3+,
(d) clo3^-

Answers: 3

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Answers

Empirical formula is the chemical formula of the simplest ratio of the number of atoms of each element present in a compound. Ionic compounds is formed when the complete transfer of electrons takes place from one element (usually metals) or group of atoms (polyatomic positive ions) to another element (usually non-metals) or group of atoms (polyatomic negative ions).

To form the ionic compounds of the given ions, we must combine a positive and a negative ion together.

When

combines with $PO_4^{3-}$ , it produces an ionic compound that has a chemical formula of (NH_4)_3PO_4

. Here 3 molecules of NH_4^+

combines with 1 molecule of $PO_4^{3-}$ .When NH_4^+

combines with $ClO_3^{-}$ , it produces an ionic compound that has a chemical formula of NH_4ClO_3

. Here 1 molecule of NH_4^+

combines with 1 molecule of $ClO_3^{-}$ .When $Fe^{3+}$ combines with $PO_4^{3-}$ , it produces an ionic compound that has a chemical formula of FePO_4

. Here 1 mole of $Fe^{3+}$ combines with 1 molecule of $PO_4^{3-}$ .When $Fe^{3+}$ combines with $ClO_3^{-}$ , it produces an ionic compound that has a chemical formula of

. Here 1 mole of $Fe^{3+}$ combines with 3 molecules of $ClO_3^{-}$ .

Thus, the ionic compounds formed are $(NH_4)_3PO_4, NH_3ClO_3, FePO_4\text{ and }Fe(ClO_3)_3$

Learn more about ionic compounds here: link

Question 22 write the empirical formula for at least four ionic compounds that could be formed from

Answer from: cuppykittyy

We can use the criss-cross method to work out the formulas.

Explanation:

The steps are

Write the symbols of the anion and cation. Criss-cross the numbers of the charges to become the subscripts of the other ion. Write the formula with the new subscripts. Divide the subscripts by their highest common factor. Omit all subscripts that are 1.

When we use this method, the formula for the compound formed from NH₄⁺ and PO₄³⁻ becomes (NH₄)₃PO₄.

The table below lists the formulas for the possible combinations.

$\begin{array}{ccc}& \textbf{PO}_{4}^{3-} & \textbf{ClO}_{3}^{-}\\\textbf{NH}_{4}^{+} & \text{(NH$_{4}$)$_{3}$PO$_{4}$} & \text{NH$_{4}$ClO}_{3}\\\textbf{Fe}^{3+} & \text{FePO}_{4} & \text{Fe(ClO$_{3}$)}_{3}\\\end{array}$

Answer from: Quest

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Answer from: Quest

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