Chemistry, 26.05.2021 01:00 braidyn1018

If only 0.225 g of Ca(OH)2 dissolves in enough water to give 0.100 L of aqueous solution at a given temperature, what is the Ksp value for calcium hydroxide at this temperature

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Answer from: jjjjj23407

The $K_{sp}$ value for calcium hydroxide at this temperature is $1.08 \times 10^{-4}$ .

Explanation:

Given: Mass of $Ca(OH)_{2}$ = 0.225 g

Volume = 0.100 L

As moles is the mass of substance divided by its molar mass.

So, moles of $Ca(OH)_{2}$ (molar mass = 74 g/mol) is calculated as follows.

$Moles = \frac{mass}{molar mass}\\= \frac{0.225 g}{74 g/mol}\\= 0.003 mol$

Molarity is the number of moles of substance present in a liter of solution.

Hence, molarity of given solution will be as follows.

$Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.003 mol}{0.1 L}\\= 0.03 M$

The equation for dissociation of $Ca(OH)_{2}$ is as follows.

$Ca(OH)_{2} \rightarrow Ca^{2+} + 2OH^{-}$

This means that $[Ca^{2+}] = 0.03$ and $[OH^{-}] = 2 \times 0.03 = 0.06$ . Hence, $K_{sp}$ value for this reaction is calculated as follows.

$K_{sp} = [Ca^{2+}][OH^{-}]^{2}\\= (0.03) \times (0.06)^{2}\\= 1.08 \times 10^{-4}$

Thus, we can conclude that the $K_{sp}$ value for calcium hydroxide at this temperature is $1.08 \times 10^{-4}$ .

Answer from: Quest

explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.

Answer from: Quest

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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If only 0.225 g of Ca(OH)2 dissolves in enough water to give 0.100 L of aqueous solution at a given...

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