Post Lab Research Connection_

QUESTION 7 Chemical Equilibria In this experiment, a spectrophotometer is used to quantify the amount of FeNCS2+ in each solution. What property of the solution does the spectrophotometer directly measure? Fe³+ (aq) + NCS (aq) FeNCS²+ (aq) Colorless Red-Orange Equilibria.pdf O A. molality O B. conductivity O C. viscosity O D. temperature OE. absorbance

What is the minimum concentration of Ca2+ (M or mol/L) required to form a precipitate with a 0.025 M Na3PO4 solution? (Ksp for Ca3(PO4)2 is 1.0 × 10-26) Enter your answer as scientific notation with the correct number of sig figs, without any units.  Use the format #e#

This series demonstrates a progression as 0.5 M solution of sodium carbonate (??2Co3) as it is added drop-by-drop to a test tube containing 0.2 M solution of lead (II) nitrate (??(??3)2).3. Write the complete ionic equation for this reaction. 4. Write the net ionic equation for this reaction. 5. What is the precipitate?

Give correct detailed Solution

LPG with bromine  Get one tube containing LPG and quickly add a few drops of bromine  Replace the cork immediately to prevent the escape of the gas  Shake the tube and observe for the appearance of a precipitate  Test for the presence of HBr with a blue litmus paper moistened with distilled water and held with tweezers. What are your observations? What is the appearance of the precipitate? Did the blue litmus paper changed in color?

As part of this experiment you will need to determine the concentrations of Fe* and SCN ions present in test tubes 1-9. These values can be calculated using the volumes and concentrations provided in Tables 1 and 2 of the Equilibrium Lab - Procedure and the dilution equation (M,V1 = M2V2). Note: the solutions provided in the lab, and therefore the tables in the lab document, are the compounds used to prepare the solution. You must determine the concentration of the ions based on how these compounds díssociate in solution Complete the following table by filling the the calculated initial concentrations of each substance. Be sure to: Pay attention to significant figures • Round appropriately Use decimal notation (not scientific) Do not include units Test Initial [Fe3*] (M) Initial [SCN'] (M) Tube 1 3 4. 6. 7 8. 2.

Calculate the initial concentrations for all the solutions. The concentration of stock solutions are as listed below the compound.

Calculate the solubility of zinc phosphate, Zn3(PO4)2 in units of grams per liter. Ksp(Zn3(PO4)2) = 9.1x10-33. solubility = g/L ??

B. Molar Concentration of an Acid Solution Acid type, HA or H,A: HA Unknown No. Balanced equation for neutralization of acid with NaOH. NaOH + HCI = NaCI + Sample 1 Sample 2 Sample 3 1. Volume of acid solution (mL) 25.0 25.0 25.0 2. Buret reading of NaOH, initial (mL) 0.00 0.00 0.00 3. Buret reading of NaOH, final (mL) 26.3 26.0 26.8 26.3 26.0 0.148 4. Volume of NaOH dispensed (mL) 26.8 5. Molar concentration of NAOH (mol/L), Part A 6. Moles of NaOH dispensed (mol) 7. Molar concentration of acid solution (mol/L) 8. Average molar concentration of acid solution (mol/L) Data Analysis, B 9. Standard deviation of molar concentration Data Analysis, C 10. Relative standard deviation of molar concentration (%RSD) Data Analysis, D

Concentration of Acetic Acid in a Vinegar Solution. Average molarity of NaOH Volume HC₂H30₂ sample Final buret reading Initial buret reading Volume NaOH (Show all units and all calculations) Molarity of HC₂H30₂ (unrounded) Average molarity of HC₂H302 (unrounded) Deviations Average deviation Best estimate for molarity of HC₂H302 Average mass percent HC₂H302 46.4mL Oml Ran out of Base ↓ ↓ ↓ ↓ 10.014 HOA je beart giov isults weari?! ferottelucuny Cambia) 10 Kousad Question 1. A Rolaids tablet contains calcium carbonate that neutralizes stomach acid. If 44.55 mL of 0.448 M hydrochloric acid is required to neutralize one tablet, how many milligrams of calcium carbonate are in a Rolaids tablet? CaCO, (s) + 2HCl(aq) → CaCl₂ (aq) + H₂O (1) + CO₂ (g)

Ksp = 3.2 x 105 for PbCl2. Which of the following mixtures will form a precipitate of PbCl2(s)? X. 100 mL 0.10 M Pb(NO3)2 and 100 mL 0.10 M NaCI Y. 100 mL 0.050 M Pb(NO3)2 and 100 mL 0.050 M NaCI Z. 100 mL 0.010M Pb(NO3)2 and 100 mL 0.010 M NaCI Z only Y only O Xand Y O Xonly

The following data were collected for the reaction 2A + 2B + C 3G+ 4 F Experiment 2 3 4 5 [A] Units of Molarity .00125 .00250 .00125 .00125 .00301 [B] Units of Molarity 00125 .00125 00302 00302 .00100 [C] Units of Molarity 00125 .00125 .00125 00375 .00115 Rate Units M/s 00870 .0174 .0508 .457 a. What is the order with respect to each reactant and what is the overall order for the reaction? Answer this question within the answer box and show your work clearly labeled on the scratch paper. b. Write the rate law for the reaction. Answer this question within the answer box and show your work clearly labeled on the scratch paper. c. What is the value and units for k? Answer this question within the answer box and show your work clearly labeled on the scratch paper. d. Predict the rate for experiment 5, you should give a value and units. Answer this question in the answer box and show your work on the scratch paper labeled clearly.

For the CO2 impact experiment station: 1)         Obtain two plastic cups, red cabbage indicator, a straw, and plastic wrap. 2)         Fill each cup approximately one-quarter to one-third full of tap water and add ~10 mL of the red cabbage indicator. 3)         Place the two cups side by side on a sheet of white paper. 4)         Place the straw into one of the beakers and cover that beaker with the plastic wrap. 5)         Carefully blow bubbles into the test cup for 3 min. and observe both cups.  6)         Compare the color to the control cup and record any differences. This the Question:  Did the beaker with the solution into which CO2 was bubbled change pH/color?  By how much?  Is this what, you would predict, based on your knowledge of the chemistry of CO2?

Better yield of crystal can be obtained if the alum solution is placed into refrigerator for a few days. Explain why. Solubility of alum, KAl(SO4)2•12 H2O in an aqueous solution at 0 degree Cecius is 114 g/L. In this experiment, calculate the weight of alum remain in the solution after crystallization completed. (Volume = 40 mL) p.s. please answer both questions

Concentration of the KSCN stock solution, M Volume of the KSCN stock solution, mL Initial molar concentration of SCN in a 50-ml flask, M PART A. Establishing the Beer's Law Coefficient: blank 0 0 solution 2 1.00×10-³ 2.00 solution 3 1.00×10-3 5.00 solution 4 1.00×10-³ 10.00 solution 5 1.00-10-3 15.00

Unknown salt calibration curve 10- The calibration curve was generated using known concentrations of five solutions of a newly discovered inorganic salt. The density value of each solution was determined and the curve with its equation is shown in the graph. A student is asked to analyze a solution of this salt with a density of 94 8- y = 0.81x+0.233 7- 5.50 g/mL. What is the concentration, in % (w/v), of the 6- 5- unknown salt solution? 4- 3- salt concentration = % (w/v) 2- 1- 4 567 89 10 Salt concentration %(w/v) 1+| Post a new auestion hulu tv MacBook Pro $ & 4 7 8. R Y U %3D F G J K .... Density (g/mL) ト * LO

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In gravimetric methods of analysis, the size and kind of precipitate formed plays an important role on the accuracy of the results obtained.  Use Von Weimarn Ratio to explain mechanism of precipitate formations. What is your desired/preferred precipitate for a gravimetric analysis? (refer to the photo below) H 1.01 S 32.07 N 14.01 Cl 35.45 Ba 137.33 P 30.97 Mg 24.31 Na 22.99 Ca 40.08 O 16.00 l 126.90 C 12.01

Table 1: Temp vs. solubility data of ammonium chloride. Test tube  g NH4Cl/10 mL H2O Crystallization temp. (ºC) 1 1.0 g/10 mL H2O 10 oC 2 1.8 g/10 mL H2O 20 oC 3 2.9 g/10 mL H2O 40 oC 4 3.8 g/10 mL H2O 65 oC 5 4.4 g/10 mL H2O 95 oC Use the table to plot a solubility curve for ammonium chloride on the graph provided below. For the best fit line, use a smooth curve. "Mass of Solute per 100 mL of H2O," should be written on the y-axis (use increments of 2g for every box). "Temperature (°C)" should be written on the x-axis (use increments of 10 °C for every 2 boxes).

1) Listen The Ksp value for calcium sulfate [CaSO4] is 2.40 X 10-5 so if a professor made 1825 mL of a CaSO4(ag) solution then how many grams of calcium (Ca2+) ion would be present in this solution. 0.3948 gram Ca2+ ion 0.4965 gram Ca2+ ion 0.2527 gram Ca2+ ion 0.4747 gram Ca2+ ion 0.3396 gram Ca2+ ion 0.2943 gram Ca2+ ion 1591.docx LAB EXP. #3 -.docx Show All