CWEA Grade I Laboratory Analyst with complete solution

CWEA Grade I Laboratory Analyst with complete solution Chloride - answer- Major anion found in many natural waters - Can impart salty taste in H2O What increases concentration of chloride in wastewater - answerChloride in human diet and softeners flushed into sanitary sewer system 2 most prevalent methods of measuring chloride - answerargentometric and mercuric nitrate Argentometric - answerTitration of sample with standard solution of silver nitrate (AgNO3) - Indicator: Chromate ions (CrO4) - End point: reddish silver chromate Mercuric Nitrate - answerTitration with standard mercuric nitrate solution -pH must be adjusted between 2.3 and 2.8 - Indicator: Diphenyl carbazone - End point: Change from blue to purple in presence of mercury Interference of Mercuric Nitrate Method - answerSulfide, bromide, orthophosphate (over 30 ppm), and iodide Why does color change in water - answerPresence of decaying vegetable matter, metal ions (ie. iron) or industrial and domestic pollution How is color measured - answerMeasured using visual comparison method Visual comparison method - answerSample compared to standards using matched nessler tubes