Could you explain why some labs would use Methyl Purple Indicator Solution for Total Alkalinity Testing vs. using Methyl Orange, or Bromocresol Green-Methyl Red Indicator?
@@Sahity i believe that both of them have different pH valve. so purple will turn color to purple at pH 4 and i think orange turn red at 3pH thats all but i think using any will be fine cause it show low pH hope that helps
Hi John. For this test it was Sulfuric Acid 0.02N (N/5O). You can see the complete reagent set online here: catalog.aquaphoenixsci.com/product/alkalinity-pt-reagent-set
You multiply the number of milliliters by 20 because that is the equivalency for this titration. When you titrate a 50mL sample with Sulfuric Acid 0.02N (N/50), each milliliter of titrant used will be equivalent to 20ppm of alkalinity expressed as Calcium Carbonate in your sample.
What if I titrate 100 mL sample with 0.02 N H2SO4 or 0.02 N HCl. What is the conversion factor? Then how to calculate the conversion factor from the given information such as, Concentration of titrant and volume of the sample.
Could you explain why some labs would use Methyl Purple Indicator Solution for Total Alkalinity Testing vs. using Methyl Orange, or Bromocresol Green-Methyl Red Indicator?
@aquaphoenixsci this is a good one
@@Sahity i believe that both of them have different pH valve. so purple will turn color to purple at pH 4 and i think orange turn red at 3pH thats all but i think using any will be fine cause it show low pH hope that helps
What was the sulfuric acid concentration used for the titrant?
Hi John. For this test it was Sulfuric Acid 0.02N (N/5O). You can see the complete reagent set online here: catalog.aquaphoenixsci.com/product/alkalinity-pt-reagent-set
Sir why we multiply by 20
You multiply the number of milliliters by 20 because that is the equivalency for this titration. When you titrate a 50mL sample with Sulfuric Acid 0.02N (N/50), each milliliter of titrant used will be equivalent to 20ppm of alkalinity expressed as Calcium Carbonate in your sample.
What if I titrate 100 mL sample with 0.02 N H2SO4 or 0.02 N HCl. What is the conversion factor?
Then how to calculate the conversion factor from the given information such as,
Concentration of titrant and volume of the sample.
@@rajamurugan2356 u still times by 20 the sample doesnt matter. for each ml of the acid u times by 20 not the water sample