5% rule

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Abigail Menchaca_1H
Posts: 104
Joined: Sat Sep 07, 2019 12:19 am

5% rule

Postby Abigail Menchaca_1H » Sun Jan 19, 2020 11:38 pm

What is this rule telling us?

Tracy Tolentino_2E
Posts: 140
Joined: Sat Sep 07, 2019 12:17 am

Re: 5% rule

Postby Tracy Tolentino_2E » Sun Jan 19, 2020 11:41 pm

If the change value, x, divided over the initial concentration is less than 5% of that initial, it's safe to assume that the change was negligible. This is to affirm that when we have a quadratic equation, we don't have to do the quadratic formula to solve for x.

Posts: 100
Joined: Sat Aug 17, 2019 12:17 am

Re: 5% rule

Postby Jared_Yuge » Sun Jan 19, 2020 11:47 pm

Its basically there to save us time so we dont have to use the quadratic formula, plus we can assume the change to the concentration to the reactant is nonexistent which is nice as well. You can always just do the problems with the quadratic formula and it will still be correct if you ever forget the 5% rule

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