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mariarad [96]
3 years ago
13

If cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? view available hint(s) if is dissolved

in water, what can be said about the concentration of the ion? it has the same concentration as the cl− ion. its concentration is half that of the cl− ion. its concentration is twice that of the cl− ion. its concentration is one-third that of the cl− ion.
Chemistry
2 answers:
Simora [160]3 years ago
8 0
The concentration of Ca2+ ions is half that of the Cl- ions.
Furkat [3]3 years ago
6 0

<u>Answer:</u> The correct answer is its concentration is half that of the Cl^- ion.

<u>Explanation:</u>

We are given a chemical compound having formula CaCl_2

It is an ionic compound because it is formed by the combination of Ca^{2+}\text{ and }Cl^- ion

When an ionic compound is dissolved in water, it breaks into its ions. The chemical equation for the ionization of calcium chloride follows:

CaCl_2\rightarrow Ca^{2+}+2Cl^-

By stoichiometry of the reaction:

1 mole of calcium chloride produces 1 mole of calcium ions and 2 moles of chloride ions

From above, it is visible that number of chloride ions is twice that of calcium ion and so will be its concentration.

Thus, the concentration of calcium ions will be half that of chloride ions.

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A sample compound contains 9.11 g Ni and 5.89g F. What is the empirical formula of this compound?
Alexxx [7]

The empirical formula of the compound is C. NiF₂.

<em>Step 1</em>. Calculate the <em>moles of each element</em>

The empirical formula is the simplest whole-number ratio of atoms in a compound.

The ratio of atoms is the same as the ratio of moles.

So, our job is to calculate the molar ratio of Ni to F.

Moles of Ni = 9.11 g Ni × (1 mol Ni /(58.69 g Ni) = 0.1552 mol Ni

Moles of F = 5.89 g F × (1 mol F/19.00 g F) = 0.3100 mol F

<em>Step 2</em>. Calculate the <em>molar ratio</em> of the elements

Divide each number by the smallest number of moles

Ni:F = 0.1552:0.3100 = 1:1.997 ≈ 1:2

<em>Step 3</em>: Write the <em>empirical formula</em>

EF = NiF₂

8 0
3 years ago
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To gain an idea as to how many atoms are in a gram or so of copper, use the larger balance
anygoal [31]

Answer:

Explanation:

To solve this problem, we must understand the relationship between mass of a substance and the number of atoms.

Atoms are the smallest indivisible particles of any matter. A substance can be made up of several number of atoms in their space.

The mass of any substance is a function of the amount of atoms its contains.

The mass of a substance is related in chemistry to the amount of atoms its contains using the parameter called the number of moles.

A mole is the amount of substance that contains the Avogadro's number of particles. This number is 6.02  x 10²³ particles. The particles here can be protons, neutrons, electrons, atoms e.t.c.

Now,

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