CHEM 270 Lab 1 _Pipetting and Volumes

20,18,2,4,15,15,10 Using these data, construct a 80% confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal.  Construct the 80% confidence interval. Round your answer to one decimal place.

Part A: Standardization of Potassium Permanganate, KMnO4 Solution Your Data Group I Group II Group III Mass of Na2C2O4 used 0.23 9 0.30 g 0.22g 0249 Initial buret reading Om L 3 mL 0 mL 0 mL Final buret reading 36.6 mL 28 mL 31.3mL 51.1mL Volume of KMnO4 used 36.6 mL 50 mL 31.3 mL 51.1mL 25+25

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Could you help me with question one please?

LabQuest 17 DATA TABLE Trial 1 2 3 4 5 6 Concentration (mol/L) 0.080 0.16 0.24 0.32 0.40 Unknown number Absorbance (no units) 0.2711 0.437 1.480 1.932 2.171 0.3 DATA ANALYSIS 1. Describe an alternate method for determining the molar concentration of your unknown sample of copper (II) sulfate solution, using the standard data.

A pipet delivers 10.9 mLmL , 10.1 mLmL , and  10.9 mLmL  in consecutive trials. Find the mean volume of the samples.  =  Answer = 10.6 mL Part B What is the average deviation from the mean for the above samples?

Please let me know which 2 answers are correct, an explanation including evidence

Convert the amount of spiperone in each sample to the concentration in the 1 ml total volume of assay tube. Express this concemtration in molar in standard form.

What should the concentration be for the acid?  Calculate the percent error.

To enter exponential values, use the format 1.0e-5. Solution 1.10 M Acetic acid (mL) 0.900 M Sodium acetate (mL) [H30*] (M) 1 8.00 2.00 2 7.00 3.00 3 6.00 4.00 4 5.00 5.00 4.00 6.00 6. 3.00 7.00 7 2.00 8.00 8 1.00 9.00 LO

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Calculate the cfu per ml of each dilutions and cfu per ml of the stock suspension (highlighted below). Show your solutions.

Need answer step by step

None

1. The concentration of NaOH from the best three of your trials. 2. The average concentration of 3 of your trials (only use 3 trials) 3. The standard deviation of your 3 trials [If you have a calculator with stats on it, you can use that/bring it to class, but for the lab report you will have to write out your calculations.] 4. Your PPT.

This is not an assignment, trying to practice for my lab exam with similar questions that may be on there.

7. A piper delivers 10.4 mL , 10.2 mL, 10.8 mL , and 10,6 mL consecutive trials . Find the mean volume and average deviation from the mean.

How do I find Concentration? flask Calculate solution Concentration (M) Volume stock of 0.40 M CuSO4 (ml) Volume of flask (ml) Absorbance at 635 nm(a.u.) 1   2.0 10 .185 2   4.0 10 .362 3   6.0 10 .510 4   8.0 10 .674 5   10.0 10 .843

Table 2: Absorbance Values of Standards and Unknowns. Sample Blank Standard Solution 1 Standard Solution 2 Standard Solution 3 Standard Solution 4 Standard Solution 5 Water Sample 1 Water Sample 2 Phosphate Concentration (in ppm) Y17 0 ppm 0.02 ppm 0.04 ppm 0.08 ppm 0.16 ppm 0.32 ppm Freeman Lake 0.001 0.325 0.292 0.413 0.315 0.039 0.054 0.049 Absorbance at 2= 690 nm Calculations: 1. Construct a phosphate standard curve in Excel by plotting concentration (in ppm) on your x-axis and Absorbance (unitless) on your y-axis for your known solutions. Label the axes on the graph and provide the curve with a title. Use a linear trendline to generate a best fit line to your data. Label the graph with the equation and the R" value. Insert your labeled graph in the space below. X

Arrange the values according to magnitude. Greatest     Least Answer Bank 7.1×10−6 3.3×10−2 52000 9.0×10−6 2.2×105

Molarity trail 1 0.0366 trail 2 0.0373 trail 3 0.0370 Calculate the standard deviation.  Calculate the Relative Standard deviation of molarity to 3 sig figs.