Solution makeup × y CHEM 131L Sol t x \\w Lecture Notes-G X PowerPoint prese x®

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Solution makeup × y CHEM 131L Sol t x w Lecture Notes-G X PowerPoint prese x® G1 michael kors HEM%20 1 3 1 L%20Solution%20Prep%20Make%20Up%20assignment%20NEW..pdf ACT Adness on Ticket H Cell Phone Health: Ye·CHFHS2015% https/Mght307wik SD why storms are beco #1 ADDITIONAL PROBLEMS- Show all work and report the answer to the correct number of significant figures. This portion may be neatly hand-written. 1. Calculate the number of potassium ions in 25.00 mL of a 0.03750 M potassium sulfate solution. What is the final concentration of a solution prepared by pipetting 15.00 mL of a 0.1057 M NaOH into a 50.00 mL volumetric flask and diluting with water to the mark? 2. 3. Suppose that you are preparing CaCl solutions What mass of CaClato would you need to add to make 100.0 mL of a 0.020 M solution? a. b. If you actually added 0.228 g of CaClzoh what would the solution concentration be? You dilute this solution 5-fold, adding 10.00 mL into a 50.00 mL volumetric flask. What is the resultant concentration? c. io

Explanation / Answer

1)

number of moles of KCl = M * volume in L

= 0.03750 M * 0.025 L

= 9.375*10^-4 mol

number of KCl atoms = number of mol * Avogadro’s number

= 9.375*10^-4 mol * 6.022*10^23 atoms/mol

= 5.65*10^20 atoms

1 KCl atom has 1 K+ ion

So, number of ion = 5.65*10^20 ions

Answer: 5.65*10^20

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