SCH3U XXXXXXXXXXName: __________________________ Molar Concentration Check In Instructions: Choose the question difficulty that corresponds with your most consistent self-assessment level. There will...

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SCH3U Name: __________________________ Molar Concentration Check In Instructions: Choose the question difficulty that corresponds with your most consistent self-assessment level. There will only be a level and feedback given, so challenge yourself to showcase what you know. Feel free to complete this on paper or electronically. Please show all your thinking. BASIC QUESTIONS: (Level 2) I’m going to start with the basics before I challenge myself with the intermediate questions. 1) Determine the volume of original stock solution required to dilute an original 1.2 M solution of ammonium hydroxide to produce 0.3 L of a 0.5 M solution. 2) How many moles of HCl must be dissolved in 560 mL of solvent to produce a solution with a molar concentration of 0.04 M? INTERMEDIATE QUESTIONS: (Level 3) I want to try the intermediate questions before I challenge myself with the advanced questions. 1) What mass of KCN is required to make 2 L of a 0.100 M solution? 2) A Chemistry teacher needs to make 0.45 L of 0.2 M NaOH solution for a class experiment. What volume of 1.5 M NaOH stock solution is required to make this solution? ADVANCED QUESTIONS: (Level 4) I have attempted the intermediate questions and I feel confident that I can challenge myself with the advanced questions. You have a summer job working as a lab-technician. On your first day, your supervisor asks you to prepare a 2.0 M sodium nitrate (NaNO3) stock solution. 1) What mass of sodium nitrate is required to produce 550 mL of the stock solution? Shortly after you finish making the stock solution, your supervisor rushes in to tell you that they’ve made a mistake. The stock solution must actually be 1.4 M (rather than 2.0 M). *You still need 550 mL of stock solution. 2) Your co-worker tells you that you must throw out the stock solution and start from scratch. Do you agree or disagree with your co-worker? Show all your work – including calculations.