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Suppose you need to prepare 1.0 L of Stock solution which must have a concentration of...

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Chemistry

Suppose you need to prepare 1.0 L of Stock solution which musthave a concentration of 150 mg N/L. You start with solid PotassiumNitrate, KNO3 .

A. How many moles of Nitrogen should 1.0 L ofStock solution contain?

B. How many moles of KNO3 should 1.0L of stock solution contain?

C. How many grams of KNO3 will youhave to weigh out to prepare 1.0 L of stock solution? (Show ALLwork!) (Reminder: the concentration of stock must be known to 3significant figures!)

2. Another Stock solution you may have toprepare must contain 80.0 mg Phosphorus /L. Using steps similar tothose used for Nitrogen Stock solution in Question 1, find how manygrams of Potassuim Dihydrogen Phosphate(KH2PO4 ) you will need to weigh out toprepare 1.0 L of such Stock solution

Answer & Explanation Solved by verified expert
3.8 Ratings (510 Votes)
1A Given the mass of nitrogen in 1L of the stock solution 150 mg 150 mg x 1 g 1000 g 0150 g Atomic mass of nitrogen 140 gmol Hence moles of nitrogen mass atomic mass 0150 g 140 gmol 00107 mol answer    See Answer
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