Why do you test a solution of CaCl2 along with your unknown when testing for the...
Why do you test a solution of CaCl2 along with your unknown when testing for the Ca2+ ion? A) It shows a visual outcome of negative results. B) It shows a visual outcome of a sample that does not have Ca2+ ions. C) It shows a visual outcome of positive results. D) It shows a visual outcome of a sample that has been contaminated
Homework Answers
Correct option is C) It shows a visual outcome of positive results.
Reason: Solution of CaCl2 surely contains Ca2+, hence it results definitely in positive reaction. So, it will provide outcome for positive result.
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Why do you test a solution of CaCl2 along with your unknown when
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1) when you have 2.0M solution of NaCl, what is the molarity of Na+ ion and...
1) when you have 2.0M solution of NaCl, what is the molarity of Na+ ion and Cl- ion? 2) If you have 2.0M solution of CaCl2, what is the molarity of Ca2+ and the molarity of CI-ion in this solution? 3) Comparing molarity of Cl-ion in 2.0M NaCl solution and 2.0M CaCl2 solution, which solution has more CI-ion? 4)Give formula of the two ions exist in a solution of 0.10M of AI(NO3)3 ? what are their respective ion concentrations?
Identification of the negative ion in the unknown solution From your test results, what negative ion (anion) is...
Identification of the negative ion in the unknown solution From your test results, what negative ion (anion) is present in your unknown? Explain your choice. Testing for Cations and Anions Report Sheet Questions and Problems Q.1 How do the tests on known solutions containing cations and anions make it possible for you to identify the cations or anions in an unknown substance? Q2 You hive a solution that is composed of either NaCl or CaCl, What tests would you run...
When 5.5 g of CaCl2 is dissolved in 1 L of solution, the concentration of CaCl2...
When 5.5 g of CaCl2 is dissolved in 1 L of solution, the concentration of CaCl2 is 0.05 molar (0.05 M CaCl2). The solution is also described as being 0.05 M Ca2+(aq) and 0.10 M Cl−(aq). The same solution could be referenced as [Ca2+] = 0.05 M. The circle represents a unit volume. It can be interpreted as “1 L”. Exploring the Model 12. What do the brackets [ ] mean? 13. Explain why the concentration of chloride is twice...
please answer all. 1) when you have 2.0M solution of NaCl, what is the molarity of...
please answer all.
1) when you have 2.0M solution of NaCl, what is the molarity of Na+ ion and Cl- ion? 2) If you have 2.0M solution of CaCl2, what is the molarity of Ca2+ and the molarity of Cl-ion in this solution? 3) Comparing molarity of Cl- ion in 2.0M NaCl solution and 2.0M CaCl2 solution, which solution has more Cl- ion? 4) Give formula of the two ions exist in a solution of 0.10M of Al(NO3)3 ? what...
QUESTION 1 The procedure for testing your unknown solution in this week's lab is identical to...
QUESTION 1 The procedure for testing your unknown solution in this week's lab is identical to the procedure which you conducted in Week 1. The only difference is, of course, your Unknown Solution may or may not contain all of the ions which you tested for in Week 1. With that being said, please consider the following scenario: You enter the lab and obtain an Unknown Solution from the Stockroom. You begin testing the solution through the steps outlined in...
QUESTION 1 The procedure for testing your unknown solution in this week's lab is identical to the procedure which y...
QUESTION 1 The procedure for testing your unknown solution in this week's lab is identical to the procedure which you conducted in Week 1. The only difference is, of course, your Unknown Solution may or may not contain all of the ions which you tested for in Week 1. With that being said, please consider the following scenario: You enter the lab and obtain an unknown Solution from the Stockroom. You begin testing the solution through the steps outlined in...
The table below shows the predicted testing outcome for a disease that affects 2% of a...
The table below shows the predicted testing outcome for a disease that affects 2% of a population, and has 90% accuracy rate. Positive Test Negative Test Total Has Disease 18 2 20 Does Not Have Disease 98 882 980 Total 116 1000 884 Given you received a positive test, w he probability that you do not have the disease? Write your answer as a percentage, rounded to the nearest tenth of a percent.
Take Test: Final Lab Report- UML tMy QUESTION 3 4pointsSave Answe When testing for complex sugars...
Take Test: Final Lab Report- UML tMy QUESTION 3 4pointsSave Answe When testing for complex sugars (starchl. your three samples are . Stach (a simple sugar postive control Water: negative control · Unknown: test sample When testing for complex sugars (starchl, your procedure is Put 10 drops of each sample into beakers Add 0.5 mL of lodine to each of your theee samples Following this test, you record these results: What do these results mean? How do you know? Sace...
yellow, green or red, the test is positive. The color of the solution depends on the...
yellow, green or red, the test is positive. The color of the solution depends on the concentration of 3. Observe the color of your negative and positive controls. Note which one has a red color. 4 After the dialysis of the NaCi-elucose-red dye solution has progressed for an hour, test the water outside the dialysis bag (your experimental data) for the presence of Ci and glucose same way you did for your controls in steps 1 and 2. Observe if...
Refer to the table which summarizes the results of testing for a certain disease Positive Test...
Refer to the table which summarizes the results of testing for a certain disease Positive Test Negative Result Test Result 89 28 Subject has the disease Subject does not have the disease 158 If one of the results is randomly selected, what is the probability that it is a false positive (test indicates the person has the disease when in fact they don't)? Round the probability to three decimal places. What does this probability suggest about the accuracy of the...
1) when you have 2.0M solution of NaCl, what is the molarity of Na+ ion and Cl- ion? 2) If you have 2.0M solution of CaCl2, what is the molarity of Ca2+ and the molarity of CI-ion in this solution? 3) Comparing molarity of Cl-ion in 2.0M NaCl solution and 2.0M CaCl2 solution, which solution has more CI-ion? 4)Give formula of the two ions exist in a solution of 0.10M of AI(NO3)3 ? what are their respective ion concentrations?
Identification of the negative ion in the unknown solution From your test results, what negative ion (anion) is present in your unknown? Explain your choice. Testing for Cations and Anions Report Sheet Questions and Problems Q.1 How do the tests on known solutions containing cations and anions make it possible for you to identify the cations or anions in an unknown substance? Q2 You hive a solution that is composed of either NaCl or CaCl, What tests would you run...
please answer all.
1) when you have 2.0M solution of NaCl, what is the molarity of Na+ ion and Cl- ion? 2) If you have 2.0M solution of CaCl2, what is the molarity of Ca2+ and the molarity of Cl-ion in this solution? 3) Comparing molarity of Cl- ion in 2.0M NaCl solution and 2.0M CaCl2 solution, which solution has more Cl- ion? 4) Give formula of the two ions exist in a solution of 0.10M of Al(NO3)3 ? what...
QUESTION 1 The procedure for testing your unknown solution in this week's lab is identical to the procedure which you conducted in Week 1. The only difference is, of course, your Unknown Solution may or may not contain all of the ions which you tested for in Week 1. With that being said, please consider the following scenario: You enter the lab and obtain an Unknown Solution from the Stockroom. You begin testing the solution through the steps outlined in...
QUESTION 1 The procedure for testing your unknown solution in this week's lab is identical to the procedure which you conducted in Week 1. The only difference is, of course, your Unknown Solution may or may not contain all of the ions which you tested for in Week 1. With that being said, please consider the following scenario: You enter the lab and obtain an unknown Solution from the Stockroom. You begin testing the solution through the steps outlined in...
The table below shows the predicted testing outcome for a disease that affects 2% of a population, and has 90% accuracy rate. Positive Test Negative Test Total Has Disease 18 2 20 Does Not Have Disease 98 882 980 Total 116 1000 884 Given you received a positive test, w he probability that you do not have the disease? Write your answer as a percentage, rounded to the nearest tenth of a percent.
Take Test: Final Lab Report- UML tMy QUESTION 3 4pointsSave Answe When testing for complex sugars (starchl. your three samples are . Stach (a simple sugar postive control Water: negative control · Unknown: test sample When testing for complex sugars (starchl, your procedure is Put 10 drops of each sample into beakers Add 0.5 mL of lodine to each of your theee samples Following this test, you record these results: What do these results mean? How do you know? Sace...
yellow, green or red, the test is positive. The color of the solution depends on the concentration of 3. Observe the color of your negative and positive controls. Note which one has a red color. 4 After the dialysis of the NaCi-elucose-red dye solution has progressed for an hour, test the water outside the dialysis bag (your experimental data) for the presence of Ci and glucose same way you did for your controls in steps 1 and 2. Observe if...
Refer to the table which summarizes the results of testing for a certain disease Positive Test Negative Result Test Result 89 28 Subject has the disease Subject does not have the disease 158 If one of the results is randomly selected, what is the probability that it is a false positive (test indicates the person has the disease when in fact they don't)? Round the probability to three decimal places. What does this probability suggest about the accuracy of the...
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