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3 years ago

How are the formulas for ionic and covalent compounds determined?

Chemistry

2 answers:

SVEN [57.7K]3 years ago

8 0

Answer:

Writing Formulas of Ionic Compounds

The cation is written first, followed by the monatomic or polyatomic anion. The subscripts in the formula must produce an electrically neutral formula unit.

olya-2409 [2.1K]3 years ago

5 0

Answer:

Pause the video to take as much time as needed. Pause it to create more wait-time to answer questions before I move on. One of the best ways to learn is to quiz yourself as you go along.

Explanation:

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Enough of a monoprotic weak acid is dissolved in water to produce a 0.0144 0.0144 M solution. The pH of the resulting solution i

alexdok [17]

Answer:

The value of dissociation constant of the monoprotic acid is $1.099\times 10^{-3}$ .

Explanation:

The pH of the solution = 2.46

$pH=-\log[H^+]$

$2.46=-\log[H^+]$

$[H^+]=0.003467 M$

$HA\rightleftharpoons H^++A^-$

Initially

0.0144 0 0

At equilibrium

(0.0144-x) x x

The expression if an dissociation constant is given by :

$K_a=\frac{[A^-][H^+]}{[HA]}$

$K_a=\frac{x\times x}{(0.0144-x)}$

$x=[H^+]=0.003467 M$

$K_a=\frac{0.003467 \times 0.003467 }{(0.0144-0.003467 )}$

$K_a=1.099\times 10^{-3}$

The value of dissociation constant of the monoprotic acid is $1.099\times 10^{-3}$ .

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4 years ago

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3 years ago

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steposvetlana [31]

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4 years ago

one molecule of chlorophyll contains 137 atoms. how many of these atoms come from the metal magnesium?

Svetlanka [38]

The chemical formula for chlorophyll is C55H72O5N4Mg. Only 1 of the 137 atoms comes from magnesium.

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3 years ago

In sediments and waterlogged soil, dissolved O2 concentrations are so low that the microorganisms living there must rely on othe

kakasveta [241]

Answer:

1) SO₄ ²⁻ : (+6)

H₂S : (-2)

Explanation:

a) Sulfate reducers are widespread in muds and other sediments, water-logged soils, etc., environments that contain SO₄ ²⁻ and become anoxic as a result of microbial decomposition.

Sulfate (SO₄ ²⁻), the most oxidized form of sulfur (+6), is reduced by these

sulfate-reducing bacteria. The end product of sulfate reduction is hydrogen sulfide, H₂S, (oxidation number -2) an important natural product that participates in many biogeochemical processes. The H₂S they generate is responsible for the pungent smell (like that of rotten eggs) often encountered near coastal ecosystems. When sulfate-reducing bacteria grow, the H₂S formed from SO₄ ²⁻ reduction combines with the ferrous iron to form black, insoluble ferrous sulfide, which is not toxic. This is important for the conservation of the environment.

b) The net ionic equation under acidic conditions is:

4 H₂ + SO₄²⁻ + H⁺ → HS⁻ + 4 H₂O

Global reaction: SO₄²⁻ + 2H⁺ → H₂S + O₂

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3 years ago