Wednesday

April 16, 2014

April 16, 2014

Posted by **someone** on Friday, April 27, 2012 at 9:07pm.

when I find the mole I get .8 for HCL and .23 for Naoh and the equilibrium conc i get is negative. then I plug it in and get it wrong. Can someone please help me?

Complete the table below: Note: Make simplifying assumptions, do not use the quadratic formula.

What is the pH of the solution created by combining 2.30 mL of the 0.10 M NaOH(aq) with 8.00 mL of the

0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)

- Chemsitry -
**DrBob222**, Friday, April 27, 2012 at 9:33pm2.30 mL x 0.10 M NaOH = 0.230 millimols.

8.00 mL x 0.10 M HCl n= 0.800 mmols.

There is no table to complete so I will make my own.

.........HCl + NaOH ==> H2O + NaCl

initial..0.8....0.......0.......0

add............0.23..................

change..-0.23..-0.23.....0.23.....0.23

equil...0.57.....0.......0.23.....0.23

So you have 0.57 millimoles HCl, no NaOH, and 0.23 millimols NaCl(which does not hydrolyze) in 2.30+8.00 = 10.30 mL.

(HCl) = mmols/mL = 0.57/10.30 = 0.0553 and convert that to pH.

----------------------------------------

Problem 2.

2.30 mL x 0.10 M NaOH = 0.230 millimoles

8.00 mL x 0.10 M HAc = 0.800 mmols.

...........HAc + NaOH ==> H2O + NaAc

initial...0.8.....0........0......0

add..............0.23

change...-0.23....-0.23....0.23..0.23

equil.....0.57.....0......0.23...0.23

So you have 0.57 mmols HAc, no NaOH, and 0.23 mmoles NaAc so you have a buffered solution. Use the Henderson-Hasselbalch equation if you are familiar with that.

(HAc) = 0.57/10.23 = ?

(NaAc) = 0.23/10.23 = ?

pH = pKa + log (base)/(acid)

pH = pKa + log (NaAc)/(HAc)

**Related Questions**

Math - Finding the reciprocal of this problem. Would like to know if I am doing ...

Math - I need help on two problems I would like if you went step by step with ...

math - If you have a circle graph 15 students like basketball 10 like soccer ...

algebra - Solve the system using elimination X+3y=5 4x+4y=4 I tried to work this...

Algebra - I have this math probelm z-(3z)/(2-z)=(6)/(z-2) in my book it says to ...

Math - Can you help me understand this math problem...I could figure it out the ...

statistics - air coin is flipped 20 times. a. Determine the probability that the...

Objects IN motion - Table 2 shows the velocity of an object at different times...

math help please - I am having a hard time understanding recprocial with ...

Math problem still stuck - Let f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a...