Question

11. The West Virginia Water Research Institute reported the following water qual ty measurements for the Monongahela River monitoring station at Mile 89 for August 2010 Mg2+ 10.6 mg/L CI15.9 mg/L so2146 mg/L pH 7.79 ALK 59.9 mg/L as CaCO Na 44.7 mg/L Ca2 39.8 mg/L (a) Determine the concentration of dissolved inorganic carbon (DIC) in the water in mol/L and in mg/L, assuming that HCO is the only significant contributor to ALK and DIC (b) Check the cation-anion balance for this analysis (c) Calculate the ionic strength of the solution (d) What is the alkalinity in meq/L, if all the alkalinity is contributed by HCO ions?

Answer 1

12. rabully babuadgad in Galostad 2Cpanhial iriatis to alo, is Ca(O+ 2coュ fomHco DIc comes Molan mam /2 bx3) That i contais 59.9 m/ laco3. 59.9- Ca iwj 160 Canbo Now canban 0o3 3Ca mtaim 12. /2 S9.9 mgCanbon 7.18 mCarka 7.19 Canb O.S99 m O. S99n cenbn. Gsz imtain O. 99 m Anoeata 7.19 /L

compon Cahiv - amin badami haur to alanlal To totad m chane amtotad no frt datenmin he omenhalm Cahon 3auionie ks eanga T calentalī -t sames have to jun in mmsl/L , hav to to deida bymola man n cationa aui an bst Caco a? okv dimhsat Cone Lowes from Caio, imd. gCano cmlaim 59.9 gCao Contmim 59.9 xe Tor 35.94 /L for cahon 44.7 myh 2 tan 23 23 CA29-8 m/ 39.8 o.995m 0.4 24 D.442 m iuit 1-43x o. 995x 2 0.4u 2x ) t

anion u35.S 0.4d M/./md 521 fnda mam 60 0.599 fnda man unt mat o to t Cahioni change amd total auoni ttherin vesy clese, tengh Lit difn duu -to ai mcasurumemt. (c) Jonie shefth cushenr, C Colnponant Na, a, 2]. preic calcmlalim, canum trahion ah From tt induwanalty ioni deferminod [Na 943 md/ 1.g43y syL

0.995x520.442 ii26.vxiiku o.5931 .99 5R4 o.u2x 4 0,44 8 a' 1.943 + 21x 4 o. S99 x4 2 8.31 x3 ves dy Atkanit ns can take onky Prei suoly alentatad coconenhrali ov H onensraln alo same as an e ist ad Hoatthin p. as 0.599 ma/L 0. 599 / O.591 ma (aef d Atkah