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4 years ago

What are the correct formulas and coefficients for the products of the following double-replacement reaction? RbOH + H3PO4→

Chemistry

1 answer:

Mandarinka [93]4 years ago

5 0

Answer:

3 RbOH + H₃PO₄ → Rb₃PO₄ + 3 H₂O

Explanation:

Let's consider the double-replacement reaction between rubidium hydroxide and phosphoric acid to form rubidium phosphate and water. The cation rubidium replaces the cation hydrogen and the anion hydroxyl replaces the anion phosphate. The balanced chemical reaction is:

3 RbOH + H₃PO₄ → Rb₃PO₄ + 3 H₂O

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Lars is balancing equations with his study group. He is unsure about one equation because each member of the study group came up

Stells [14]

Answer:

3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O

Explanation:

This a proper way to balance the equation:

- Count the OH from the base (2)

- Count the H from the acid (3)

We can make 2 molecules of H₂O but we still have one more H

H₃PO₄ → dissociates in → 3H⁺ + PO₄³⁻

Ca(OH)₂ → dissociates in → Ca²⁺ + 2OH⁻

So, to form the salt, you must have 3 Ca²⁺ to react with 2 (PO₄³⁻) to make global charge of +6/-6

Therefore, if you have 3 Ca in the salt, you may have 3 Ca in the base.

So, if you have 2 phosphate in the salt, you must have 2 PO₄³⁻ in the acid.

Now you have 6 protons in the acid (6H) and 6 (OH) in the base; in conclussion you can make 6 H₂O.

Finally the ballance equation is:

3 Ca(OH)₂ + 2 H₃PO₄ → Ca₃(PO₄)₂ + 6H₂O

8 0

4 years ago

Read 2 more answers

#1/ 81.8 grams carbon 18.2 grams hydrogen molar mass 132.0g/mol.

dlinn [17]

Answer:

#2 Empirical formula _Na3S4O9____

Molecular formula ___Na6S8O18__

Explanation:

4 0

3 years ago

A substance that permits the flow of electrons is a(n) .

kap26 [50]

It is a conductor - it allows electrons to flow

6 0

3 years ago

Read 2 more answers

If 185 g of KBr are dissolved in 1.2 kg of water, what would be the expected change in boiling point? The boiling point constant

Fudgin [204]

Answer:

ΔTb = 0.66 C

Explanation:

Given

Mass of KBr = 185 g

Mass of water = 1.2 kg

Kb = 0.51 C/m

Explanation:

The change in boiling point (ΔTb) is given by the product of molality (m) of the solution and the boiling point constant (Kb)

$\Delta T_{b}= K_{b}* m$

$Molality = \frac{moles\ KBr}{Kg\ water} \\\\moles KBr = \frac{mass\ KBr}{Mol.wt\ KBr} = \frac{185}{119} = 1.555\\\\Molality (m) = \frac{1.555 }{1.2} =1.296 m\\$

[tex]\Delta T_{b}= 0.51 C/m * 1.296 m = 0.66 C[\tex]

6 0

4 years ago

Read 2 more answers

What is the total number of protons and neutrons in an atom called?

anzhelika [568]

This is called the Mass Number of the isotope of the atom.

Isotopes are different forms of the same atom. They have the same number of protons but different number of neutrons.

Carbon-12 has mass number 12 as it has 6 protons and 6 neutrons.

Carbon-14 has mass number 14 as its has 6 protons and 8 neutrons.

5 0

3 years ago