WebAssign.netThursday, May 3, 2007 01:32 PM EDT Logged in as adpatel@ncsu. Logout Home | My Assignments | Grades | Communication | Calendar Guide | Help | My OptionsHome > My Assignments > CH202 In Lab 01Reaction Stoichiometry (In-Lab) PATEL AMIT DIPAK CH 202, section 020,Spring 2007 Instructor: hong qian TA North Carolina StateUniversity About this Assignment Due: Wednesday, January 17, 2007 11:00 PM ESTCurrent Score: 50 out of 50 Question Score Submission Options DescriptionWelcome to your first CH202 In-Lab Assignment. You will need to be careful about how many significant figures you report. Your CH201 instructor has likely covered significant figures. Below is a quick review.When multiplying or dividing values, the number of significant figures (sf) reported in the answer should be equal to the lowest number of significant figures in the calculational values. For example:1.5 M x 10.4 mL = 15.6mmol. 1.5 M has 2 sf. 10.4 has 3 sf. The answer should be reported to 2 sf. Therefore, the reported answer should be 16 mmol.When adding or subtracting values, the number ofsignificant figures (sf) reported in the answer should be equal to the lowest common place value in the calculational values. For example:16 mmol - 8.2 mmol = 7.8 mmol. However, 16mmol is only reported to the one's place value. Therefore, the reported answer should also only be reported to the one's place value as 8 mmol.When reporting a value such as 20 to two significant figures, please enter "20." with a decimal place behindthe zero to indicate theone's place value is signicant.Finally, please note that many of the calculated values that you enter into Webassign are marked correct or incorrect based upon the values you have input earlier in the same question. If you change a value earlier in the assignment, it may cause later inputsto change their status from correct to incorrect. Please look are earlier inputs if youencounter a situation in which the exact same data is markedcorrect for your lab partner and incorrect for you.1. 35/35 points Last Response | Show Details All Responses Notes 1. Data TablesData Table A. Initial concentrations of HCl, H3PO4 and NaOH[HCl] 1.5 [1.5] M [H3PO4] 1.0 [1.0] M [NaOH] 1.5 [1.5] MData Table B. Temperature data for combinations of NaOH and HCl(aq)Expt #mL NaOHmmol NaOHml H2OmL HClmmol HClInitial T, °C Final T, °C T, °C1 2030.[30.]20 1015[15]23.7[23.7]27.8[27.8]4.1[4.1]2 2030.[30.]10 2030.[30.]23.8[23.8]32.4[32.4]8.6[8.6]3 2030.[30.]0 3045[45]24.1[24.1]33.0[33.0]8.9[8.9]Data Table C. Temperature data for combinations of NaOH and H3PO4Expt #mL NaOHmmol NaOHml H2OmL H3PO4mmol H3PO4Initial T, °C Final T, °C T, °C4 1523.[23]30 1515[15]24.1[24.1]29.9[29.9]5.8[5.8]5 3045[45]15 1515[15]23.8[23.8]33.5[33.5]9.7[9.7]6 4568.[68]0 1515[15]24.1[24.1]34.1[34.1]10.0[10.0]2. Construct a reaction table for experiment #1, the addition of 20 mL each of NaOH and H2O with 10 mL of HCl.All entries should be in millimoles.You should enter 0 for the initial NaCl concentration. HCl(aq) + NaOH(aq) NaCl(aq) + H2Oinitial15 [15] 30. [30.] 0 [0]----------change ( )-15 [-15] -15 [-15] 15 [15]----------final0 [0.0] 15 [15] 15 [15]----------3. For experiment #1, which is the limiting reagent?(_) (_) NaCl (o) (o) HCl (_) (_) H2O (_) (_) NaOH 4. Which experiments from 1-3 have the same change in temperature? (Select all that are correct.) [_] [_] 1 [x] [x] 2 [x] [x] 35. For the experiments from 1-3 with the same temperature change, what other parameters are the same?(Select all that are correct.) [_] [_] mL H2O [x] [x] mmol NaOH [x] [x] initial concentration of NaOH [_] [_] mmol HCl [_] [_] initial concentration of HCl [x] [x] total mL of solution6. Which experiments from 4-6 have the same change in temperature? (Select all that are correct.) [_] [_] 4 [x] [x] 5 [x] [x] 67. For the experiments from 4-6 with the same temperature change, whatother parameters are the same?(Select all that are correct.) [_] [_] mL H2O [x] [x] total mL of solution [x] [x] initial concentration of H3PO4 [x] [x] mmol H3PO4 [_] [_] mmol NaOH [_] [_] initial concentration of NaOH2. 15/15 points Last Response | Show Details All Responses Notes Type your name in the answer box. Your instructor will enter your discretionary lab grade in the score box for this question. Amit PatelKey: Enter a discretionary score for this student, if lower than full credit.Ask Your Teacher Extension Request Home My Assignments WebAssign® 4.0 © 1997-2003 by North Carolina State University. Portions © 2003-2007 by Advanced Instructional Systems, Inc. All rights