iv
PENENTUAN KESADAHAN Ca2+ DAN Mg2+PADA AIR BAKU DAN AIR RESERVOIR DI PDAM TIRTANADI INSTALASI DELITUA MEDAN
ABSTRAK
Telah dilakukan analisa kesadahan pada air baku dan air reservoir di PDAM Tirtanadi Instalasi Delitua Medan. Kesadahan air terutama disebabkan oleh ion – ion Ca2+ dan Mg2+, kesadahan magnesium dan kalsium di tentukan dengan metode titrasi menggunakan Na2EDTA dan indikator EBT untuk kesadahan total dan
indikator mureksid untuk kadar kalsium. Nilai kesadahan magnesium ditentukan dengan pengurangan volume (ml) titrasi Na2EDTA pada kesadahan total CaCO3
dengan volume (ml) titrasi Na2EDTA pada kadar kalsium. Dari hasil titrasi
diperoleh kesadahan total air baku 222,6 mg CaCO3/L , kadar kalsium 17,28 mg
Ca/L , kadar magnesium 42,mg Mg/L dankesadahan total air reservoir 74,66 mg CaCO3/L , kadarkalsium 13,28 mg Ca/L , kadar magnesium 10,06 mg /Mg/L.Nilai
kesadahan air pada air reservoir di PDAM Tirtanadi intalasi delitua Medan telah memenuhi standar kesadahan menurut EPA,1974 .
v
DETERMINATION HARDNESS Ca2+ AND Mg2+OFRAW WATERANDWATERRESERVOIRINSTALLATIONINPDAM
TIRTANADI DELITUA MEDAN
ABSTRACT
Has conducted analysis on the raw water hardness and water reservoir in PDAM Tirtanadi Installation Delitua Medan. Mainly caused by water hardness ions - ions Ca2 + and Mg2+ , magnesium and calcium hardness is determined by titration method using Na2EDTA and indicators EBT to total hardness and mureksid
indicator for the level of calcium. Magnesium hardness value is determined by the reduction in volume (ml) Na2EDTA titration the total hardness of CaCO3 with the
volume (ml) Na2EDTA titration on calcium levels. From the results obtained by
titration of total hardness of raw water 222.6 mg CaCO3 / L, 17.28 mg calcium
levels Ca / L, 42 levels of magnesium, Mg mg / L and total hardness of water reservoirs 74.66 mg CaCO3 / L, calcium levels 13 , 28 mg Ca / L, magnesium
content of 10.06 mg / mg / L. The value of water hardness in the water reservoir in the taps Tirtanadi intalasi Delitua Medan has met the standard hardness according to the EPA, 1974.
