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Florida International University-Department of Civil and Environmental Engincering ENV3001L: Environmental Engincering Lab | Spring 2024 EXPERIMENT #5: Determination of different forms of alkalinity in water samples by titration with a standard acid solution Pre-Laboratory Assignment Student Name: QQ nos éfia“. 200 PIDt: _A\QRS DATE: (O | &3 | 352\, Instructions: Read corresponding pages from the \ lanual. Watch videos posted on Canvas Module for this week 's experiment. As appropriate, use and highlight kev concepts defined in the Manual, explain reasoning, show explicit dimensional analysis. Answer cach question in the space provided. 1) The Mecthod APHA 2320 is a titration analysis for Alkalinity to determine hydroxide (OH'), carbonate (CO;™) and bicarbonate (HCOx) forms of alkalinity in water. What arc two major similarities and two major differences ompared to the titration method used in Experiment #37 Céko\io‘\&tl&mboifmjl-k\lmkm 0 aralbRreond edde makdhads wRd ko dakiumaanar sha o&Q&W NVGING LT P, e W U I) lor vomle. A dljotae dn diek Yo NGO wih ' Y T Guokon maxdal daat - Jobe o o W wd Joo daduanonaed Nha ) 0 S Bl — JouX dv e NooRo 2) Give the definitions of the “Palkalinity™ and “Talkalinity™ titration endpoints that apply to the procedure used in this Experiment. Use words to explain how the titration endpoints are identified. Give the mathematical expression that communicates what Palkaliny volume and Talkalinity volume are in Vallaliniyy = o @wmd ok aolinlicuasy o @)+ f o Ul sodsy” = AVENToT. ol fi;«,’ @omed CL\L‘_-\DAQD‘QL;\_gty . Sy (O + (087 + (o 3) Read the Manual. In the context of Experiment #5. if you add a few drops of phenolphthalein indicator to a sample - and it remains colorless what can you conclude about this sample? Explain ool dok M 4l eou wlow songe thadidolene dougpny dot. =D e C/gx.mgf&,\q\% Efi::nllg o o&,tdvuc, - bw asuoxoe dodaT. Scanned with CamScanner

4) A studentanalyzed a sample of water collected from a lake at the FIU Maidique Campus to assess its alkalinity and buffering capacity using the APHA 2320 method. To perform this analysis, the student measured a 60 mL portion of the water sample and followed the step-by-step procedure in the Manual page 33. The titration was conducted using a standardized solution of hydrochloric acid (HCI) with a concentration of 0.0321 M. The student observed the phenolphthalein indicator changing from magenta to colorless after adding 2.00 mL of the titrant. Subscequently., added a few drops of methyl orange to the same sample and proceeded with the titration until the color change from orange to salmon was noticed. The student recorded the volume of titrant consumed from the first to the sccond indicator color change as 8.00 mL. (a) Foraccurate interpretation of the results of APHA 2320 it is necessary to record the P-and T-alkalinity volumes correctly. In this case, what are the P- and T-alkalinity volumes? Did HIC student record the vales correctly? wm\,\k}’r e = vdme SuousS ek gl s =00 vl Tm0iasy e, = wlime. ) \iauts 0dded faam gy Yo o uond dow dargg D L0+ 8.0 = b.owl (b) Use Table 5.1 to identify which forms of alkalinity exist in the sample and determine the volume of the titrant that was consumed to neutralize these forms. <1 & (OQ,&"W oy~ e ook (¢) Apply the correct pair of cquations (Equations 3.3a. 5.3b or Equations 5.4a. and 5.4b) to convert the volume of titrant associated with cach analyte into concentration units cxpressed in milligrams per liter (mg/L) as calcium carbonate (CaCOs). \ 13! S @t GOy ) — @y @) + T () mL Ll WL ol - 0csM . | oy 2 vl Py 0.5 osch L rp an ey Fou b wl o @ 0:dL - o.oMM . trwed - S ——'——fi“'fifi‘——f——. 7 (d) If instead of HCI. 0.0321 M sulfuric acid is used as titrant. what volun® of fitralit would be consumed to rca‘cv:fiM the equivalent point of a 30 mL of the water sample? S ool Buouks Rowe o oM rodiokon WL N ad L—-\-@v\«,ﬂ.:o.od.@_\, & mlL .0l 5) Healthand safety. Use information for 0.05 M H>SO, posted on the Canvas Module. H=Health, F=Fire. R=Reactivity NFPA (HF.R) | NFPA Hcalth Hazard Rating Description and Personal Protection Scanned with CamScanner

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