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6 7. If carefully add titrant to lower pH exactly 0 3 pH umts and record volume CalculatIOns 7 1 PotentlOmetnctitratlOn to pH 45 Alkalmlty, mg!1 Caco3= A x N x 50,000 ml of sample 5.2 StandardaCId(sulfuncorhydrochlonc),01N DIlute30mlconcH2S04or83mlconc HCl to 1lIter wIth dIstIlled water StandardIze versus 400 ml of0 05 N Na2C03solutIOn wIth about 60 ml distIlled water by tltratmg potentlOmetncally to pH of about 5 LIft electrode and rmse mto beaker BOll solutIon gently for 3-5 mmutes under a watch glass cover Cool to room temperature RInse cover glass mto beaker Contmue tItratIOn to the pHmflectlOnpomt Calculatenormahtyusmg 6.1 6 2 6 3 Sample SIze 6 1 1 Use a sufficIently large volume of tltr~nt'( > 20 ~lm a 50 ml buret) to obtam good preciSIon whIle keepmg volume low enough to permIt sharp end pomt 612 For<1000mgCaCO/1use002Ntitrant 613For>1000mgC~CO/luse01NtItrant ~ \' 6 1 4 A prelImmary titratIOn IS helpful Potentlometnc tItratIon 6.2 1 Place sample m flask by plpettmg wIth pIpet tIp near bottom offlask 622 MeasurepHofsample 6 2 3 Add standard aCId (5 2 or 5 3), bemg careful to stIr thoroughly but gently to allow needle to obtam equIlIbnum 1624 TItrate to pH 4 5. Record volume pftltrant PotentlOmetnc tItratIOn oflow alkalImty 63 1 For alkalmity of <20 mg!1 titrate 100-200 ml as above (6 2) usmg a 10 ml microburet and 0 02 N aCId solutIOn (5 3) 632 Stop tItratIon at pH m range of 43-47, record volume and exact pH Very 11, ' \ t ~ , , , , .' 53 Standard aCId (sulfunc or hydrochlonc), 002 N DIlute 200 0 ml of 0 1000 N standard aCId to 1 lIter wIth dIstilled water StandardIze by potentlometnc tItratIOn of 15 0 ml 0 05 N N a 2C 0 3 S o l u t I o n a s a b o v e Procedure N= AxB 5300 x C where A = g Na2C03weIghed mto 1lIter B= mlNa2C03solutIOn C == ml aOld used to mflectlon pomt . 310 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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