Swirl the conical flask during the titration to ensure the solutions are mixed. To ensure reliability in a titration: Carry out at least two accurate titrations and calculate an average titre.

2 M CaCl 2 stock solution. Dissolve 14.7 g of CaCl 2 and adjust to 100 ml with H 2 O and filter-sterilize. This solution can be stored at −20 °C in 15-ml conical tubes with 13.5 ml per tube for ...

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