SN1 and SN2 reactions?

1. how does SN1 reaction cause acid-base indicator, phenolphthaleing to change color?

2. Why is it important that volume of 0.5 M NaOH be exact?
3. which is stronger acid HCl or HBr? which is the stronger base Cl- or Br-? explain briefly.

Answer:
1. Most nueclophiles are have a storng anion, which can strip a hydrogen from water and create a hydroium ion.

2. I don't know about your specific lab
3. HBr and Br- because bromine has the smaller atomic radius, and thus greater charge density.
1. RX + H2O = ROH + HX
Forms acid.

ROH + HX = RX + H2O
Consumes acid.

2. I have no idea what you're talking about. It this from a lab?

3. Both HCl and HBr are strong acids in aqueous solution. In the gas phase HBr is stronger. Bromide is larger and more polarizable so is the better nucleophile.

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