Homework Answers
The precision of an experiment is considered as the closeness of two or more measurements to one other. For example, if you weigh a given substance five times, and get 1.01 kg each time, then your measurement is precise or for a titration, if you are getting the same value for 5 times, your experiment is precise. Precision is independent of accuracy. Accuracy is the closeness of a measured value to an original value.
Thus for establishing precision of a titration, it has to repeat for several times.
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To establish the precision of a titration you would repeat the titration several times. compare the...
Titration of acetic acid. 4. What is the advantage of doing three trials, especially since you...
Titration of acetic acid.
4. What is the advantage of doing three trials, especially since you are doing exactly time? What does your standard deviation tell you about the precision of your results'? is, especially since you are doing exactly the same thing each 5. Error analysis. Suppose during the titration you added NaOH sufficient to change the indicator to a much darker pink color. How would this affect your experimental result? Would this increase of decrease your experimental acetic...
1. What is the definition of an 'equivalence point' in an acid/base titration? (1 point) 2....
1. What is the definition of an 'equivalence point' in an acid/base titration? (1 point) 2. In part one of the experiment, you will prepare the acid solutions being titrated from a stock solution. Describe how you will accurately prepare 10.00 mL of 0.100 M HCl solution using a 1.00 M HCl stock solution. In your response to this question, be very specific about the quantities of stock solution and deionized water to be used in the dilution and the...
Part C Now, repeat the experiment several times to investigate how the amount of time to...
Part C Now, repeat the experiment several times to investigate how the amount of time to charge the capacitor (resulting in a voltage difference equal to the emf of the battery) depends on the capacitance of the capacitor and the resistance of the resistor. Each time you repeat the experiment, you first need to open the switch and right-click or control-click on the capacitor to select Discharge Capacitor. The amount of time ________ if the resistance is increased and ________...
Discussion: 1. Compare the molarities of the three samples of vinegar that you analyzed. The "precision"...
Discussion: 1. Compare the molarities of the three samples of vinegar that you analyzed. The "precision" of your titration technique is how similar the three values are (the closer the values, the better your precision). 2. Compare the average molarity you obtained to the molarity of the acetic acid in the vinegar as listed on the vinegar bottle. What could account for any differences between these values? 3. How do your pH values compare to the pH determined using the...
It's a weak acid strong base titration Experiment 4: Identification of an unknown acid by titration...
It's a weak acid strong base titration
Experiment 4: Identification of an unknown acid by titration Page 2 of 15 Background In this experiment, you will use both qualitative and quantitative properties to determine an unknown acid's identity and concentration. To do this analysis, you will perform a titration of your unknown acid sample-specifically a potentiometric titration where you use a pH meter and record pH values during the titration, combined with a visual titration using a color indi- cator...
Given the following relationships, how would the reaction shift to establish or maintain equilibrium? a. Q>K...
Given the following relationships, how would the reaction shift to establish or maintain equilibrium? a. Q>K b. Q<K c. Q=K How would the equilibrium shift given the following stresses on the following reaction? A (l) + B (g) ↔ 2C (g) + D (l) ΔH = 145 kJ Removal of compound D Increase in temperature Decrease in pressure Indicators are usually organic molecules with functional groups that will accept or donate protons to the solution which will change the structure...
Compare if you have accuracy and precision. If I have obtained two values of measuring the...
Compare if you have accuracy and precision. If I have obtained two values of measuring the same thing. I have obtained the spring constant value of K = 4.4086± 0.0399 from (F vs x graph) and K=4.449 ± 0.01378 obtained from ( Square period vs mass graph). ( of a two experiments). Please comment in accuracy by considering that you are measuring the same k.
Q1: In part A you will prepare a dilution solution of 0.1M NaOH using a 500mL...
Q1: In part A you will prepare a dilution solution of 0.1M NaOH using a 500mL graduated cylinder and pump dispenser. The solution is then mixed and stored in the amber bottle found in your drawer. Be sure the cap is in good condition. Calculate the volume of 6.0M NaOH needed to make 450 mL of about 0.7 M NaOH. Do not include units in answer. Q2: After the first trial, in order to maximize the titration precision, the sample...
The chart below has entries for several steps along the titration curve (which shows the pH...
The chart below has entries for several steps along the titration curve (which shows the pH as a function of the volume of NaOH solution added). To calculate the pH at each step, you must first understand what species are present and which chemical reactions are occurring, as that will dictate the method needed to calculate the pH. For each volume listed, Fill in the table with the major species (one or more) present in solution that could impact the...
You wish to compare the average startup times of the Alpha and Beta brands of laptop...
You wish to compare the average startup times of the Alpha and Beta brands of laptop computers. To do this, you take random samples of 10 Alphas and 20 Betas and compute their average startup times. To do the hypothesis test in Excel, you should use the z-Test: Two Sample for Means. True or False
Titration of acetic acid.
4. What is the advantage of doing three trials, especially since you are doing exactly time? What does your standard deviation tell you about the precision of your results'? is, especially since you are doing exactly the same thing each 5. Error analysis. Suppose during the titration you added NaOH sufficient to change the indicator to a much darker pink color. How would this affect your experimental result? Would this increase of decrease your experimental acetic...
1. What is the definition of an 'equivalence point' in an acid/base titration? (1 point) 2. In part one of the experiment, you will prepare the acid solutions being titrated from a stock solution. Describe how you will accurately prepare 10.00 mL of 0.100 M HCl solution using a 1.00 M HCl stock solution. In your response to this question, be very specific about the quantities of stock solution and deionized water to be used in the dilution and the...
Discussion: 1. Compare the molarities of the three samples of vinegar that you analyzed. The "precision" of your titration technique is how similar the three values are (the closer the values, the better your precision). 2. Compare the average molarity you obtained to the molarity of the acetic acid in the vinegar as listed on the vinegar bottle. What could account for any differences between these values? 3. How do your pH values compare to the pH determined using the...
It's a weak acid strong base titration
Experiment 4: Identification of an unknown acid by titration Page 2 of 15 Background In this experiment, you will use both qualitative and quantitative properties to determine an unknown acid's identity and concentration. To do this analysis, you will perform a titration of your unknown acid sample-specifically a potentiometric titration where you use a pH meter and record pH values during the titration, combined with a visual titration using a color indi- cator...
The chart below has entries for several steps along the titration curve (which shows the pH as a function of the volume of NaOH solution added). To calculate the pH at each step, you must first understand what species are present and which chemical reactions are occurring, as that will dictate the method needed to calculate the pH. For each volume listed, Fill in the table with the major species (one or more) present in solution that could impact the...
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