How would the calculated molar mass change (increase,decrease, no change) if the following experimental problems were...
How would the calculated molar mass change (increase,decrease, no change) if the following experimental problems were encountered? Explain the reason(s) for your answer. a) The unknown was impure and only part of the unknown dissolved in the lauric acid. b) Your unknown contained a substance which produced two ions per molecule of unknown when dissolved in the lauric acid. c) The unknown was insoluble in lauric acid. d) A very small amount of lauric acid was spilled after weighing, but before being placed in the test tube.
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How would the calculated molar mass change (increase,decrease,
no change) if the following experimental problems were...
how would the calculated molar mass change if the following experimental problems were encountered? Explain the...
how would the calculated molar mass change if the following experimental problems were encountered? Explain the reasons for your answer. a. the unknown was impure and only part of the unknown dissolved in the Lauric acid. b. your unknown contained a substance that produced two ions per molecule of unknown when dissolved in the Lauric acid. (experiment on Lauric acid for freezing point depression)
1. A student performed a freezing point determination and calculated the molar mass of an unknown...
1. A student performed a freezing point determination and calculated the molar mass of an unknown like you did in this experiment. The only difference in procedure was that when determining the freezing point of the unknown-naphthalene mixture, they started with a clean empty test tube. If the following errors occurred, how would each affect the calculated molar mass of the solute (too high, too low, or no change)? Explain your answers. a. The thermometer used actually read 2.0 celcius...
How would each of the following errors have affected the value of the molar mass? (For...
How would each of the following errors have affected the value of the molar mass? (For each, write "too large", "too small", or "no effect"). a) The FP of cyclohexane was read too high.______ b) The FP of the solution was read too high._______ c) A student used 10 mL of cyclohexane and converted it directly to 10 g without weighing it.____ d) A student spilled some of the unknown after weighing it, so that not all of the weighted...
Indicate whether the following experimental mistake will increase, decrease, or have no effect on the calculated...
Indicate whether the following experimental mistake will increase, decrease, or have no effect on the calculated value of R. A student completed the experiment without waiting for the test tube to cool after heating. Select ALL of the correct answers. a. All measurements should be made at the same temperature. b. The volume measured from the beaker will be high. c. The measured temperature is room temperature. d. The calculated value of Ris low. e. The calculated value of Ris...
2. How many mL of 0.100M NaOH would you need to titrate if you measured out...
2. How many mL of 0.100M NaOH would you need to titrate if you measured out 0.120 g of oxalic acid? Must show calculation. (5 pts) lying an unknown acid Objective: Identify an unknown diprotic acid by determining its molecular weight. Introduction: A diprotic acid is an acid that yields two H ions per acid molecule. Therefore, two moles of NaOH are need to react with every one mole of diprotic acid. The net reaction of a diprotic acid, H:X,...
Unknown acid 2 6. Complete the following table. Trial 1 Trial 2 Trial 3 Mass of...
Unknown acid 2 6. Complete the following table. Trial 1 Trial 2 Trial 3 Mass of unknown (8) 0.175 0.120 0.122 Initial buret reading (mL) 0.00 22.37 0.00 Final buret reading (mL) 22.37 44.85 22.83 Volume of NaOH added (mL) 22.37 22.48 22.83 We will assume that the data collected for the first trial is not accurate. 7. What is the average mass of unknown acid for Trials 2 and 3? (Must show calculations) 8. What is the average volume...
Titration: Acids and Bases 2. How can you determine which acid is diprotic? 3. using the...
Titration: Acids and Bases
2. How can you determine which acid is diprotic?
3. using the answers to questions one and two, which acid is
diprotic?
4. Which base has more hydroxide ions per molecule?
Acid Volume Base Base Initial Volume (mL) Base Final Volume (mL) Volume of Base Used (mL) Acid: Base Ratio Acid 1 20 mL Base 1 50 mL 34.5 15.5 4:3 Acid 2 20 mL Base 1 Acid 1 20 mL Base 2 Acid 2 20...
Separating a Mixture, Recrystallization, pre-lab assignment could you also explain why you chose that substance for...
Separating a Mixture, Recrystallization, pre-lab
assignment
could you also explain why you chose that substance for the empty
spaces and question marks
EXPERIMENT 4 Pre-Lab Assignment Separating a Mixture, Recrystalliration Name Date 1. Complete the following flowchart which shows how to separate a mixture of sand, sodium chloride and acetanilide. Notice that after a separation process (a down arrow) the filtered solids are shown on the left and the filtrate (the liquid) is shown on the right. The terminal step...
Exercise 2 Separation of a Mixture Based on Acid-Base Properties One purpose of this exercise is...
Exercise 2 Separation of a Mixture Based on Acid-Base Properties One purpose of this exercise is to learn how to use a separatory funnel to extract a single component away from other compounds in solution. To do so, we will apply the principles of solubility and acid-base behavior you’re seeing in class. One of the compounds is neutral in the acid-base sense. It has no ability to either donate or accept a proton from an aqueous solution, and will remain...
1. Which of the following are the sites within the human body where carbon dioxide and...
1. Which of the following are the sites within the human body where carbon dioxide and oxygen are exchanged? A. Alveoli B. Arteries C. Synapses D. Venules 2. Which of the following describes the most important reason for repeating an experimental investigation? A. To verify the validity of the original findings B. To expand upon the original investigation C. To manipulate the independent variable D. To attempt to disprove the hypothesis 3. Lithium has an atomic number of 3 and...
Indicate whether the following experimental mistake will increase, decrease, or have no effect on the calculated value of R. A student completed the experiment without waiting for the test tube to cool after heating. Select ALL of the correct answers. a. All measurements should be made at the same temperature. b. The volume measured from the beaker will be high. c. The measured temperature is room temperature. d. The calculated value of Ris low. e. The calculated value of Ris...
2. How many mL of 0.100M NaOH would you need to titrate if you measured out 0.120 g of oxalic acid? Must show calculation. (5 pts) lying an unknown acid Objective: Identify an unknown diprotic acid by determining its molecular weight. Introduction: A diprotic acid is an acid that yields two H ions per acid molecule. Therefore, two moles of NaOH are need to react with every one mole of diprotic acid. The net reaction of a diprotic acid, H:X,...
Unknown acid 2 6. Complete the following table. Trial 1 Trial 2 Trial 3 Mass of unknown (8) 0.175 0.120 0.122 Initial buret reading (mL) 0.00 22.37 0.00 Final buret reading (mL) 22.37 44.85 22.83 Volume of NaOH added (mL) 22.37 22.48 22.83 We will assume that the data collected for the first trial is not accurate. 7. What is the average mass of unknown acid for Trials 2 and 3? (Must show calculations) 8. What is the average volume...
Titration: Acids and Bases
2. How can you determine which acid is diprotic?
3. using the answers to questions one and two, which acid is
diprotic?
4. Which base has more hydroxide ions per molecule?
Acid Volume Base Base Initial Volume (mL) Base Final Volume (mL) Volume of Base Used (mL) Acid: Base Ratio Acid 1 20 mL Base 1 50 mL 34.5 15.5 4:3 Acid 2 20 mL Base 1 Acid 1 20 mL Base 2 Acid 2 20...
Separating a Mixture, Recrystallization, pre-lab
assignment
could you also explain why you chose that substance for the empty
spaces and question marks
EXPERIMENT 4 Pre-Lab Assignment Separating a Mixture, Recrystalliration Name Date 1. Complete the following flowchart which shows how to separate a mixture of sand, sodium chloride and acetanilide. Notice that after a separation process (a down arrow) the filtered solids are shown on the left and the filtrate (the liquid) is shown on the right. The terminal step...
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