Pipet 5 mL of sample to 1000 mL of DI water, mix thoroughly. Take a 100 mL aliquot, add a Bromcresol GreenMethyl red Powder Pillow to sample. Titrate to violetgray endpoint (pH ) using N acid. The final value should be 125 mg/L alkalinity. Repeat the processes using 1 mL of alkalinity standard for 1000 mL .