07 Notes - Indicators

07 Notes - Indicators - Used for: strong acid/weak base...

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Aim: What are indicators and how do they work? QQ: 25 mL of 0.50 M H 2 SO 4 is neutralized with 38 mL of Al(OH) 3 . Write and balance the neutralization equation. Is the salt A/B/N? Solve for the M B . Do Now: How do we know when a titration is over? Indicators Weak acids or bases that are different colors at different pH levels Signal when the endpoint of a titration is reached. Methyl Orange pH range: 3.2 – 4.4 Used for: strong acid/weak base Bromothymol Blue pH range: 6.0 – 7.6 Used for: strong acid/strong base Phenolphthalein pH range: 8.2 – 10 Used for: weak acid/strong base Litmus pH range: 5.5 – 8.2 Used for: strong acid/strong base Bromcresol Green pH range: 3.8 – 5.4
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Unformatted text preview: Used for: strong acid/weak base Thymol Blue pH range: 8.0 9.6 Used for: weak acid/strong base Practice: What color will a solution with a pH of 12 be if phenolphthalein is the indicator? A solution is blue in the presence of bromcresol green, and yellow in the presence of bromothymol blue. Is this solution acidic or basic? You are titrating KOH with H 2 CO 3 . What would be an appropriate indicator choice? Conclusions Indicators are used to signal the end of a neutralization reaction Indicators will be different colors at different pH levels Select an indicator based on what the endpoint of the titration will be Use reference table M!...
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07 Notes - Indicators - Used for: strong acid/weak base...

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