# Chemistry

Calculate the volume of 0.05 M NaOH which must be added to 100 cm3 of 0.05 M methanoic acid to obtain a buffer of pH 4.23.�(Ka for methanoic acid = 1.77 x 10-4)

1. 👍
2. 👎
3. 👁
1. methanoic acid = HM
millimols HM = 100 x 0.05 = 5.

...HM + OH^- ==> M^- + H2O
I...5....0.......0.....
C..-x...-x.......x
E..5-x...x.......x

Substitute the E line into the Henderson-Hasselbalch equation and solve for x = millimols NaOH.
Then M NaOH = mmols NaOH/mL NaOH. Substitute and solve for mL of 0.05 M NaOH. I've estimated the answer at about 25 mL of the .05 M NaOH. Post your work if you get stuck.

1. 👍
2. 👎

## Similar Questions

1. ### Chemistry

1.) Watch the animation, and observe the titration process using a standard 0.100 M sodium hydroxide solution to titrate 50.0 mL of a 0.100 M hydrochloric acid solution. Identify which of the following statements regarding

2. ### CHEMISTRY

a) Calculate the change in pH when 4.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). b) Calculate the change in pH when 4.00 mL of 0.100 M NaOH(aq) is added

3. ### Chemistry 12

Hi, I did the acid-base titration lab with HCl and 0.5M NaOH. I need to calculate the moles of NaOH from molarity of NaOH and the average volume used. My English isn't good but is it asking me to find the moles of NaOH using the

4. ### chemistry

Calculate the change in pH when 9.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Calculate the change in pH when 9.00 mL of 0.100 M NaOH(aq) is added to the

1. ### chemistry.

Which solution contains 0,1 mol of sodium hydroxide? A- 1 cm3 of 0,1 mol dm3 NaOH B 10 cm3 of 0,1 mol dm3 NaOH C 100 cm3################### d 100 cm3 ###################

2. ### chemistry

A volume of 100mL of 1.00 M HCl solution is titrated with 1.00 M NaOH solution. You added the following quantities of 1.00 M NaOH to the reaction flask. Classify the following conditions based on whether they are before the

3. ### Chemistry

“1.25 g of crushed limestone was added to 50.0 cm3 of 1.00 mol dm-3 hydrochloric acid (an excess). The mixture was left until all bubbling stopped and was then made up carefully to 250 cm3 with pure water. A 25.0 cm3 sample of

4. ### Chemistry

Consider the titration of 100.0 mL of 0.100 M HC2H3O2 by 0.100 M KOH for the next five questions (Ka for HC2H3O2 = 1.8 x 10-5). Calculate all pH values to two decimal places. 1) Calculate the pH after 0.0 mL of KOH has been added.

1. ### Science

What is the density of a book whose mass is 1,800 g and whose volume is 300 cm3? *My Answer*You want to identify the numbers first, density = mass ÷ volume. Which would give you, 1800g ÷ 300 cm³ = 6 g/cm³. *Cant Figure Out

2. ### Pre-AP Chemistry

Volume (cm3 Area(cm2) Thickness (cm) .20 cm3 100 cm2 0.002 cm .28 cm3 122 cm2 0.002 cm .24 cm3 144 cm2 0.017 cm .41 cm3 225 cm2 0.0018cm If you had used a very crude balance that allowed only one significant figure, how would this

3. ### Chemistry help??!

A student reduces the temperature from a 300 cm3 balloon from 60°C to 20°C. What will the new volume of the balloon be? 264 cm3

4. ### Chemistry

1)A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared. Calculate the initial pH of this solution. The Ka for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places. *A buffered solution