enbel ZFIO You want to analyze a magnesium nitrate solution. (a) In your lab you have...
You have a toxic chromium nitrate solution (5.00x10^2 g total solution mass). You don't the oxidation state of the chromium ( assume that it does not change over the course of this protocol. By adding excess sodium carbonate (na2co3), you precipitate 67.6g of cr2 (co3)3. Calculate the molality of the original chromium nitrate solution. A. 1.23 Molal B. 1.34 Molal C 1.39 Molal D. 1.48 Molal E. 1.57 molal
i am needing help with question 4 and 5. anything else helps Name Experiment 7 Calorimetry Postlab: Questions 25 points possible Section (day&time) Instructor Due date Answer the following questions using complete sentences and support your answers with swers calculations, if desired. Attach additional pages as necessary. Handwritten or typed an are acceptable.(5 pts per question) 1. If som e of your hot metal remained in the test tube when it was transferred to the eter, would its calculated molar...
Suppose we have bought a cleaner at the grocery store, and notice it gives off a gas that turns moist red litmus paper blue. Which of the following chemical species *could* be the culprit? Group of answer choices Acetic Acid Ammonia Sodium ions Hydrogen Gas Question 21 You notice a white, crystalline powdered substance in your pantry but have no idea what it is. Suppose the substance was bought at the grocery store years ago, and the label has worn...
You have 315 mL of an aqueous solution that is 0.29 M Na2SO4 and a separate 250 mL aqueous solution that is 0.41 M BaCl2- a). How many moles of each of the four ions are present (do not use the word "moles" in your answer, just the number)? Na+ 5042- Ba2+ ci b). When these two solutions are mixed together, what is the chemical formula of the solid expected to precipitate from the mixture? (Don't forget to put (s)...
Purpose: To calculate the amount of AgNO3 present in an unknown solution of water through the process of gravimetric analysis with NaCl. Background: Have you ever had difficulty lathering soap or find that the scum in your shower constantly needs to be removed? These are signs of “hard water.” Soap does not lather well in hard water because metal ions, such as Ca2+, form precipitates, creating “soap scum.” A precipitate is an insoluble compound that forms when soluble ions in...
Determining Solution Concentration by Evaporation Pre-lab Nam Section In the lab, you weigh an empty beaker and find it to be 28.3456 grams. You use a volumetric pipet to transfer 50.00 mL of a sodium chloride solution into the beaker and weigh the beaker again to get 80.5678 grams. You boil the salt water, being careful to turn down the heat near the end of the process in order to minimize the amount of 'popping' that occurs. At the very...
I have completed this lab (Experiment 13 Acid and Base, Part 2) and want feedback on if I doing the equations correctly? I have included my answers in the question. Are these correct? Pour about an inch of lemon juice into one jar and label it "acid." Put two level teaspoons of baking soda and about half a tablespoon of water in another jar. Now pour a tablespoon of lemon juice acid into the third jar for testing. Add the...
Please just complete the questions that don’t require any more supplemental information 1. Write out the net ionic equation for the reaction you performed in Formula Weight of a Copper Compound. Assume that you start with a Cu?- salt. Based on the reactions we have discussed, what type(s) of reaction does this represent? __( ) + ( ) → _ C + ( ) reaction type: 2. In a separate experiment, you determine that the percent-by-mass of Ag in a...
Your lab is studying the decomposition of potassium thiocyanate in aqueous solution. At 22.15°C, you find that the rate law constant is 0.427 M-2min-1. One of your labmates has found that at 14.29°C the rate law constant is 0.0527 M-2min-1. What is the activation energy for this reaction? Report your answer in kilojoules per mole, kJ/mol, and use R = 8.314J/mol*K in your calculations.
Your lab is studying the decomposition of potassium thiocyanate in aqueous solution. At 24.21°C, you find that the rate law constant is 0.413 M-2min-1. One of your labmates has found that at 12.13°C the rate law constant is 0.0525 M-2min-1. What is the activation energy for this reaction? Report your answer in kilojoules per mole, kJ/mol, and use R = 8.314J/mol*K in your calculations.