Determine the number of moles of calcium per mole of calcium hydroxide.
My answer is:
Because there is only one calcium ion per mole of calcium hydroxide, the mole of calcium ion is equal to the mole of calcium hydroxide.
Is this a correct justification?
It is worded oddly, and wrong.
Let me correct it...
Because there is only one calcium ion per formula unit of calcium hydroxide (Ca(OH)2), the number of moles of calcium per mole of calcium hydroxide is one.
Yes, your justification is correct. In a chemical formula, the subscripts indicate the number of atoms or ions of each element present in one molecule or formula unit of a compound.
In the case of calcium hydroxide (Ca(OH)2), there is one calcium ion (Ca2+) and two hydroxide ions (OH-) present per formula unit. Since the question asks for the number of moles of calcium per mole of calcium hydroxide, we only need to consider the calcium ion.
Therefore, the number of moles of calcium is equal to the number of moles of calcium hydroxide because there is one calcium ion per mole of calcium hydroxide.
No, your justification is incorrect. The correct justification would be as follows:
To determine the number of moles of calcium per mole of calcium hydroxide, we need to use the chemical formula of calcium hydroxide, which is Ca(OH)2.
From the formula, we can see that there is one calcium ion (Ca2+) and two hydroxide ions (OH-) in one molecule of calcium hydroxide.
To calculate the number of moles of calcium per mole of calcium hydroxide, we need to compare the molar ratio of calcium to calcium hydroxide.
The molar ratio is determined by the coefficients in the balanced chemical equation. In this case, the equation would be:
Ca(OH)2 --> Ca2+ + 2OH-
From the equation, we can see that one mole of calcium hydroxide produces one mole of calcium ions (Ca2+). Therefore, the number of moles of calcium per mole of calcium hydroxide is 1 mole.
So, the correct answer is that there is one mole of calcium per mole of calcium hydroxide.