Question

SHOW ALL WORK NO WORK - NO CREDIT 1. You weigh out an antacid tablet and determine the mass to be 1.1990 g. After taking a 0.2455 g sample of the antacid tablet, vou dissolve it in 25.00 mL of a 0.1006 M solution of hydrochloric acid in a 250.0 mL Erlenmeyer flask. After heating the solution to get rid of carbon dioxide, you titrate the leftover hydrochloric acid in the solution in the Erlenmever flask with a 0.09913 M solution of sodium hydroxide and determine that it takes 14.71 mL of the sodium hydroxide solution to react with the leftover hydrochloric acid in solution. Determine the milligrams of calcium carbonate in the sample of antacid tablet and then determine the milligrams of calcium carbonate in the entire antacid tablet. 2. What indicator will be used for this titration reaction? What color change will occur? 42am

Answer 1

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Antaid tablet The heaution blw coutaius Caco3 CacO and tu is Coca Caclt co Cag TEnst 25.00mL of o. 1006 M H s addad Motanily no f motessoluli (ma) Valame of Saution CL) hMxV (0.1006M)(35.0mL)-(0.1006 Mot/L) e.025) 0.0025 ma From this, cone of Hel s used to nuhralze aud the RAwaliuing s -tabeala with Naot Naclcag t t0 () Hel cag) t NaotCag) (2 (o.04913 mal/L)(.7im) - .09919 m/L)0.04L) 0.00l6 mof Maok Prom #mof He eauts tt O.00up6 ma tHel searts caith .0ot46 mat Naof 1 maf NaOH (1 mat ratio) the no-of mstes f Hel eauted Now, calculate ntal mai O. 00ns maf-O.00146nust 0o104 mat. #From eg with 2 Caco seaeta mot 0.00104 mt He with Cacos eaut md .00052 ma Cacos, md x o.o O104 mot 2 mof (mds ars nurtar mas Mass of Caco=no of mndles x malar maus O.000S2mat x (oo.089/mdt .052 of Cac0 = caco paeseut u o.24 55fSample f antead. Caco s paesenrn .19gog f tablet Cto0m-1 52 mg Thes So o.05ag kl.1990 , 954of Gaos pret n o fablut a54 mg O. O.24 phanalphthalein indicalor. If gives uo colour on addition of NaOH Here we tums pink petCoforless) wth acts aud Coftev end paint)