Expt 2 Postlab

Payal

1. Explain both precision and accuracy as they pertain to chemical measurements.  2. Why would you use the method of standard addition to calibrate a measurement instead of a calibration curve?

The image uploaded answer is not allowed please bro hero expert

Solve for #2 if #1 is correct.

Please help answer these error analysis questions This is determining the percentage composition of magnesium oxide

What is calibration and why is it essential in relation to food analysis? Provide examples.

On 12 and 13 I got a negative scientific on one and a positive on the other. Did I make a mistake typing it into my calculator?

EXPERIMENT : GRAVIMETRIC ANALYSIS OF PHOSPHORUS IN PLANT FOOD Aim: To determine the amount of phosphorus in a commercial plant food   I want the Calculations for this experiment

I have the data, I only need the calculations of the last page.

Data Tabla 51589 3.053 54.639 52.99 g 52.939 Mass of empty crucible Mass of hydrate Mass of crucible and salt (before) heating Mass of crucible and salt (after: measurement 1) Mass of crucible and salt (after: measurement 2) Mass of water driven off Mass of Anhydrous Salt (Hydrate - Water) In lab a group was trying to determine the hydration number of a sample of Cobalt(II) chloride. In lab they were able to collect the required data (above) but had to finish the lab for homework. Once at home they forgot how to complete the calculation. Would you kindly help them with their calculation? What is the hydration number of this hydrate?

Differentiate between "Complete Analysis”, “Ultimate Analysis” and “Partial Analysis”. Give an example of where each of the three forms of analysis may be used.

Suppose that you heated the hydrated copper (II) sulphate in a test tube, instead of a beaker. How might this affect your results? 4 MAY 19 ... MacBook Pro & * %23 $ 2 3 4 5 6 7 E Y U G H J K C V M MOSISO command option command レー

How would i solve

Please check my work. Analyze the data for the sample to get the Empirical formula of CxHy Given data for the sample compound with no oxygen: Mass of sample (g): 5.99 Mass of carbon dioxide collected (g): 19.25 Mass of water collected (g): 6.57

Calculate the moles of anhydrous (dry) KAl(SO4)2 that were present in the sample. Show all work to answer this question by uploading an image of your calculations into Photo 2. Calculate the ratio of moles of H2O to moles of anhydrous KAl(SO4)2. Show all work to answer this question by uploading an image of your calculations into Photo 3. Note: Report the ratio to the closest whole number. Write the empirical formula for the hydrated KAl(SO4)2, based on your experimental results and answer to Question 2. Show all work to answer this question by uploading an image of your calculations into Photo 4. Describe any visual differences between the hydrated sample and the dried, anhydrous form. How would the following errors affect the empirical formula for the compound?  a. The student ran out of time and did not do the second heating. Explain how this error will affect the calculation for the number of moles of water in the hydrate? Will the final answer be artificially high or low? How do…

Calculate the moles of anhydrous (dry) KAl(SO4)2 that were present in the sample. Show all work to answer this question by uploading an image of your calculations into Photo 2. Calculate the ratio of moles of H2O to moles of anhydrous KAl(SO4)2. Show all work to answer this question by uploading an image of your calculations into Photo 3. Note: Report the ratio to the closest whole number. Write the empirical formula for the hydrated KAl(SO4)2, based on your experimental results and answer to Question 2. Show all work to answer this question by uploading an image of your calculations into Photo 4. Describe any visual differences between the hydrated sample and the dried, anhydrous form. How would the following errors affect the empirical formula for the compound?  a. The student ran out of time and did not do the second heating. Explain how this error will affect the calculation for the number of moles of water in the hydrate? Will the final answer be artificially high or low? How do…

Determine the formula weight of NH4Cl. Provide an answer to two decimal places.

Suppose that in a gravimetric analysis, you forget to dry the filter crucibles before collecting precipitate. After filtering the product, you dry the product and crucible thoroughly before weighing them. Is the apparent mass of product always high or always low? Is the error in mass systematic or random?

Tell whether each of the following errors will cause the experimental mass percent of the sodium bicarbonate to be higher than, lower than, or the same as the true value. Explain your answer. The crucible was not heated long enough prior to adding mixture. Some of the carbonate spattered out from the crucible during heating The sample was not heated to constant mass. The mass of mixture used is greater than the recommended mass.

A 2.37 gram sample of a KCI and KCIO3 mixture was found to contain 0.01611 mol of KCIO3. What is the percent by mass of KCIO3 in the original mixture? Report your answer with three significant figures. A Click Submit to complete this assessment. Question 5 of 5