A0.20 mol sample of mgcl2(s) and a 0.10 mol sample of kcl(s) are dissolved in water and diluted to 500 ml. what is the concentration of cl- in the solution?

1 M

Explanation:

Magnesium chloride will furnish chloride ions as:

Given :

Moles of magnesium chloride = 0.20 mol

Thus, moles of chlorine furnished by magnesium chloride is twice the moles of magnesium chloride as shown below:

Moles of chloride ions by magnesium chloride = 0.40 moles

Potassium chloride will furnish chloride ions as:

Given :

Moles of potassium chloride = 0.10 moles

Thus, moles of chlorine furnished by potassium chloride is same as the moles of potassium chloride as shown below:

Moles of chloride ions by potassium chloride = 0.10 moles

Total moles = 0.40 + 0.10 moles = 0.50 moles

Given, Volume = 500 mL = 0.5 L (1 mL = 10⁻³ L)

Concentration of chloride ions is:

The final concentration of chloride anion = 1 M

The concentration of the chloride ion, Cl¯ in the solution is 1 M

To obtain the answer to the question given above, we'll begin by calculating the number of mole of chloride ion, Cl¯ produced by each compound in the solution. This can be obtained as follow:

MgCl₂(aq) —> Mg²⁺(aq) + 2Cl¯(aq)

From the balanced equation above,

1 mole of MgCl₂ produced 2 moles of Cl¯.

Therefore, 0.2 mole of MgCl₂ will produce = 0.2 × 2 = 0.4 mole of Cl¯

KCl(aq) —> K⁺(aq) + Cl¯(aq)

From the balanced equation above,

1 mole of KCl produced 1 mole of Cl¯

Therefore,

0.1 mole of KCl will also produce 0.1 mole of Cl¯.

Next, we shall determine the total mole of Cl¯ in the solution.

Mole of Cl¯ from MgCl₂ = 0.4 mole

Mole of Cl¯ from KCl = 0.1 mole

Total mole of Cl¯ = 0.4 + 0.1

Finally, we shall determine the concentration of Cl¯ in the solution.

Total mole of Cl¯ = 0.5 mole

Volume = 500 mL = 500 / 1000 = 0.5 L

Concentration = mole / Volume

Concentration of Cl¯ = 0.5 / 0.5

Therefore, the concentration of Cl¯ in the solution is 1 M

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explanation:

according to the u.s. department of agriculture, the label of "certified organic" comes with a set of highly regulated standards for environmental stewardship and resource conservation. some of these include maintenance and improvement of soil quality, prevention of ground and surface water contamination, greenhouse gas regulation, encouragement of biodiversity and conservation of water and energy (see references 1). organic practices integrate natural methods such as mulching, plant diversity, native and adapted plants, crop rotation and the introduction of beneficial insects to control pests without synthetic pesticides.

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health implications of pesticides

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other important considerations

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