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## Unique Eclectic Chemistry Tutor

### Marriottsville, MD (21104)

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# Robyn's Responses in WyzAnt Answers

#### solve for each equation for the variable indicated 1. s+4t= r is s2. 3m-7m= p for m

it sf or algebra 1

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Asked by Alisssa from Mountain Home A F B, ID
00

1. s + 4t = r

To solve for s (get it on one side), we subtract 4t from both sides to get:

s = r - 4t

2.  3m-7m = p

Since 3m and 7m both contain an m, we can combine them.

3-7= -4 so -4m = p

To solve for m, divide both sides by -4

m = -p/4

#### Solve the given equation for x.-3x=-21

Solve the given equation for x.-3x=-21

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Asked by Maritza from Palm Coast, FL
00

If you divide both sides by the -3 that is in front of the x, you get x = 7.

#### Consider the titration of 300.0 mL of 0.500 M NH3 (Kb = 1.8 ×10-5) with 0.500 M HNO3. At the stoichiometric point of this titration the pH is?

Consider the titration of 300.0 mL of 0.500 M NH3 (Kb = 1.8 ×10-5) with 0.500 M HNO3. At the stoichiometric point of this titration the pH is?

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Asked by Jose from Nashville, TN
01

The overall reaction is:

NH3 + HNO3 ---> NH4NO3

The Kb of NH3 refers to the reaction:

NH3 + H2O ---> NH4+ + OH-

The pKb = -log(Kb) = -log(1.8 x 10^-5) = 4.7

As a side note, my book says the Kb is actually 1.74 x 10^-5

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## Background Check Status for Robyn R.

Robyn R. passed a background check on 1/21/2013. You may run an updated background check on Robyn once you send an email.