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Potassium iodide (KI) is sometimes added to table salt to supplement diets low in iodide ion (I⁻) - Leaving Cert Chemistry - Question (h) - 2014

Question (h)

Potassium iodide (KI) is sometimes added to table salt to supplement diets low in iodide ion (I⁻). Calculate the daily mass of potassium iodide needed to supply 0.15... show full transcript

Worked Solution & Example Answer:Potassium iodide (KI) is sometimes added to table salt to supplement diets low in iodide ion (I⁻) - Leaving Cert Chemistry - Question (h) - 2014

Step 1

Calculate the amount of iodide ion in potassium iodide

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Answer

To find the amount of potassium iodide needed to provide 0.15 mg of iodide ion, we first need to consider the molar mass of potassium iodide (KI) and iodide ion (I⁻). The molar mass of KI is approximately 166 g/mol and that of I is about 127 g/mol.

Using the proportion, we can set up the following calculation:

$X = rac{0.15 ext{ mg} imes 166 ext{ g/mol}}{127 ext{ g/mol}}$

Step 2

Perform the calculation

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Answer

Calculating this gives us:

$X = rac{0.15 imes 166}{127} = 0.196 ext{ mg}$

Thus, the mass of potassium iodide required to supply the 0.15 mg of iodide ion is approximately 0.196 mg.

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