Explain why would you rinse the pipette and second time

Why rinse pipette with distilled water in titration?

Should you use a clean pipette tip for each sample?Group of answer choicesNo - we can't waste tipsYes - because changing tips is funNo - they are self-cleaningYes - to avoid contamination

1. A burette was rinsed with deionised water but was not rinsed with the river water sample before filling it.Consequence: The river water would be because of residual water, and the concentration of hydronium ion in the river water and the pH .2. A  volumetric flask used to make the NaOH standard is filled past the mark.Consequence: The concentration of the NaOH standard would be than thought. A volume of river water would be needed to neutralise the standard. The concentration of acid in the river water would be .3. NaOH on the balance for a while before the mass is recorded. Consequence: NaOH is , meaning that it absorbs moisture from the air.  The amount of NaOH is therefore than thought.  The concentration of the NaOH standard would be than thought. A larger volume of river water would be needed to neutralise the standard. The concentration of acid in the river water would be .

In the cabbage water beaker that changed color the fastest, why do you think this occurred?  Be specific!

If an experiment calls for 0.1 ml of sterile saline solution, which pipette should you grab? Group of answer choices P20 P200 P1000