Chem 145 Lab 4

Number 2,3,and 4

Select one for each box

I need help calculating the Molarity of the solution in the first picture please!!!

Experiment-A8: Spectrophotometry of Cobalt( Pre-laboratory Exercises 1. (a) Define Beer's law and give the mathematical equation (specify each symbol in the equation). concentration of achemical Solution Beer's Law states that the in the following A = Ebc is directly proportional to its absorption of light & can be calculated formula (b) Briefly explain what Beer's plot is and how do you obtain the Beer's constant (k) from the plot. is a straight line with _ay-intercept Beer's plot of zero & a slope of ab oreb. It represents the absorptunity the length Absorbance 8 can be calculate by multiplying Constant by the path length then dinding that value by the 2. The following solutions are prepared from 0.200 MNICI, and their absorbance measured at 725 nm. Solution # 1 2 3 4 5 Volume (mL) of 0.200 M NiCh 1.00 2.00 3.00 4.00 pride 5.00 Volume (mL) of H₂O 4.00 3.00 2.00 1.00 0.00 INICI] (a) Calculate the molar concentration of NiCl₂ in each solution 1-5. Absorbance at 725 nm 0.105 0.210 0.315…

Calculate the volume of NaOH used in each trial. Use sig figs.

I only need parts d. And e. Solved please. Thanks.

Question is attached

7 Solid lead (II) nitrate is slowly added to 125 mL of a 0.190 M potassium hydroxide solution until the concentration of lead ion is 0.0547 M. The percent of hydroxide ion remaining in solution is %. Submit Answer $ 4 R LLO % 5 [Review Topics) [References Use the References to access important values if needed for this question. Retry Entire Group T Cengage Learning | Cengage Technical Support ^ 6 * 8 more group attempts remaining MacBook Pro G H 2 & 7 A J * 0 8 ( 9 UD U K F 0 ) O ◆ P | Previous Email Instructor { [ + 11 = Next> Save and Exit } ]

Correct answers are given in second picture!!! Please show me how to get them and explain!

Week 8-1 X + " https://app.101edu.co 79°F Mostly cloudy Substance NH:(9) HCI (g) NH.CI (S) Chapter 5 x 00 5.3 The Fu X 00 Quiz 5.1 to x 0o DESU Calc X 2 W " # 3 * E $ 4 27 O R 12 Calculate AS for NH3(g) + HCI(g) → NH4Cl(s). % 5 " Search 40 6 الت " S* (J/mol-K) 192.5 186.7 94.6 4- & 7 YIL M Log In | Fe X Aktiv Chen X U Question 8 of 23 4+ 8 DA hp 9 ► 11 M ) IL O O Flashcards X O A4 P C { Photograp X A + L A = O Welcome X Ⓒ P } 1 4 7 +/- G prt sc 。 2 5 8 delete backspace B Log In | Fe X + J/mol K 3 6 9 0 home . num lock x 1 end G 7 home

DATA AND CALCULATIONS Show all calculations neatly on an attached sheet. Trial 1 Trial 2 Trial 3 70.6849. 68.0749 2.61g 23.25ML O.65ML 22.6mL Mass of flask + vinegar Mass of empty flask Mass of vinegar used Final buret reading Initial buret reading Volume of NaOH used Moles of NaOH used 0.00226 mol Moles of açetic acid titrated Mass of acetic acid titrated Mass % acetic acid in vinegar 5.0%

assignmentProblemID=142966924&offset3=next CHE154-H Gen Chem II Bronikowski S20 Part A Determine the percent ionization of a 0.245 M solution of benzoic acid (K, = 6.5 x 1) Express your answer using two significant figures. > View Available Hint(s) 1 ΑΣφ ха Хь х IXI X•10" Submit Previous Answers

Please don't provide handwritten solution .....

i need help calculating the molar concentration for part C

5mL of NaOH

Line equation?

McGraw Hill C Chegg - Get 2 MOTION EYE OWLv2 | Assig Submit Answer Content *OWLv2 | Orx t.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator assignment-take CengageNOW Retry Entire Group 4 more group attempts remaining New Tab [Review Topics] [References] A solution was made by dissolving 7.01 g sodium chloride (NaCl) in 56.9 g water (H₂O). What is the mole fraction of water in this solution? Mole fraction = C Other Bookr

hese answers will not be recorded Visited In the laboratory you dilute 3.13 mL of a concentrated 12.0 M hydroiodic acid solution to a total volume of 100 mL. What is the concentration of the dilute solution? M Submit Answer [References] Use the References to access important values if needed for this question. Try Another Version 10 item attempts remaining

# ? The volume of water needed to dissolve 0.0674 grams of calcium sulfate is Assume no volume change upon addition of the solid. 80 Submit Answer 54 $ 4 000 000 [Review Topics) [References] Use the References to access important values if needed for this question. Retry Entire Group % 5 more group attempts remaining Cengage Learning Cengage Technical Support MacBook Pro 6 4 & 7 ▶II * 00 61 9 ) O- 1 L. Email Ins I (Pre J

Data And Report Recrystallization Of Acetanilide Recrystallilzation Observations of Solubility Tests Table 1. Solubility tests Soluble at 25 °c Soluble at bollng polnt acetone Yes Yes ethanol Yes Yes petroleum ether No No water No Yes Volume of solvent used (mL) 10.8 5% of solvent added 0.54 Mass of initial acetanilide (g) Mass of filter paper (g) 0.475 0.301 Mass of filter paper with acetanilide (g) 0.736 Calculations and Analysis Recrystallilzation solvent used Saved Choose... Mass of recovered acetanilide (g) Your percent recovery Look up the expected melting point for the recovered acetanilide. Normal BIIIU X2| X² | → EEE Based on the video on the course page, describe what you should see during recrystallization. BII|U X2 | X² | Normal