青云翻译

Pipette accurately 20.00ml calcium standard solution in 250ml conical flask, add 4ml 10% naoh solution and 3-4 drops of calcium indicator, shake.

Move the accurate preparation of calcium 20.00ml standard solution for 250ml in the conical flask, add 4ml and 10%NaOH solution 3~4 calcium indicator drops, shake.

Moves accurately takes the 20.00ml calcium standard solution in the 250ml conical flask, adds 4ml the 10%NaOH solution and 3~4 drop of calcium indicator, swings uniform.

Accurate removed 20.00 ML calcium standard solution in 250 ml conical flask plus 4 ML 10% solution and 3 ~ 4 drops NaOH calcium indicator, shake up.

Move the accurate preparation of calcium 20.00ml standard solution for 250ml in the conical flask, add 4ml and 10%NaOH solution 3~4 calcium indicator drops, shake.