Question

Prepare 1 liter of a 0.250M hypochlorite buffer solution. What volume of 1.5M NaOH must be...

Prepare 1 liter of a 0.250M hypochlorite buffer solution. What volume of 1.5M NaOH must be added to get a buffer with a pH of 8? Ka value for the acid is 3.00 x 10^-8.

My answer is 41.7 mL.

Homework Answers

Answer #1

PH     = PKa + log[salt]/[Acid]

PH = 8

PKa = -log3*10-8   = 7.5228

8 = 7.5228 + logx/0.25-x

logx/0.25-x = 8-7.5228

logx/0.25-x   = 0.4772

x/0.25-x       = 100.4772

x/0.25-x       = 3

x                 = 3(0.25-x)

x              = 0.1875 moles of NaOH

molarity of NaOH   = no of moles/volume in L

1.5                          = 0.1875/volume in L

volume in L           = 0.1875/1.5   = 0.125L   = 125ml

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A buffer solution contains 0.52 mol of hypochlorous acid (HClO) and 0.39 mol of sodium hypochlorite...
A buffer solution contains 0.52 mol of hypochlorous acid (HClO) and 0.39 mol of sodium hypochlorite (NaOCl) in 3.00 L. The Ka of hypochlorous acid (HClO) is Ka = 3e-08. (a) What is the pH of this buffer? pH =__________. (b) What is the pH of the buffer after the addition of 0.21 mol of NaOH? (assume no volume change) pH = ___________. (c) What is the pH of the original buffer after the addition of 0.20 mol of HI?...
1.What volume of a 1.50 M NaOH solution should be added to 50.0 mL of 1.20...
1.What volume of a 1.50 M NaOH solution should be added to 50.0 mL of 1.20 M acetic acid (CH3CO2H; Ka = 1.76×10-5) to obtain a buffer with pH = 5.450? a) 33.3 mL b) 6.70 mL c) 16.4 mL d) 67.0 mL e) 42.1 mL 2. Find the concentration of hydronium ion, H3O+, in a 0.200 M solution of sodium hypochlorite, NaOCl. Ka(HOCl) = 3.0×10-8. a) 7.8×10-5 M b) 1.3×10-10 M c) 1.0×10-7 M d) 3.9×10-11 M e) 2.6×10-4...
3.Here you prepare a buffer solution using hypochlorous acid (HCIO2) and potassium hypochlorite (KCIO2). a) If...
3.Here you prepare a buffer solution using hypochlorous acid (HCIO2) and potassium hypochlorite (KCIO2). a) If you mix 150ml of 0.15M HCIO and 2.00g of KCIO, what will be the pH of this buffer solution? Ka of hypochlorous acid is 2.5x10-9. b) If you add 10ml of 0.50 M HCl to the prepared buffer solution from a), what will be the pH of this solution? c)If you add 1ml of 5M NaOH to the original buffer solution (from A)), what...
A buffer solution contains 0.30 mol of hypochlorous acid (HClO) and 0.83 mol of sodium hypochlorite...
A buffer solution contains 0.30 mol of hypochlorous acid (HClO) and 0.83 mol of sodium hypochlorite (NaOCl) in 7.50 L. The Ka of hypochlorous acid (HClO) is Ka = 3e-08. (a) What is the pH of this buffer? pH = (b) What is the pH of the buffer after the addition of 0.24 mol of NaOH? (assume no volume change) pH = (c) What is the pH of the original buffer after the addition of 0.25 mol of HI? (assume...
To a 1.00 L buffer solution made of 1.95 M hypochlorous acid (HClO) and 1.03 M...
To a 1.00 L buffer solution made of 1.95 M hypochlorous acid (HClO) and 1.03 M potassium hypochlorite (KClO) was added 0.509 moles of NaOH (assume no volume change to the solution). What is the final pH of this buffer assuming Ka hypochlorous acid = 2.90e-8?
a. Your product research director wants you to prepare 1 liter of a buffer solution of...
a. Your product research director wants you to prepare 1 liter of a buffer solution of pH 6.5 having a buffer capacity of 0.10 using a combination of NaH2PO4 and Na2HPO4. What is the exact concentration of each constituent required for this preparation? Ka (NaH2PO4) = 6.2 x 10-8.
A buffer solution is made by mixing 0.100 liter each of 0.400 M acetic acid and...
A buffer solution is made by mixing 0.100 liter each of 0.400 M acetic acid and 0.200 M sodium acetate. For acetic acid, Ka=1.8 x 10^-5 a. What is the pH of the buffer? b. Assuming no change in volume, what is the pH of the solution after the addition of 0.0100 moles of KOH molecules are added? (KOH is a strong base in water solution)
What volume of 2.0 M NaOH must be added to 100.0 mL of 2.5 M CHOOH...
What volume of 2.0 M NaOH must be added to 100.0 mL of 2.5 M CHOOH (Ka= 1.8 x10-4) to prepare a buffer with a pH of 4.0?
Prepare a buffer by direct addition. Consider how best to prepare one liter of a buffer...
Prepare a buffer by direct addition. Consider how best to prepare one liter of a buffer solution with pH = 3.62 using one of the weak acid/conjugate base systems shown here. Weak Acid Conjugate Base Ka pKa HC2O4- C2O42- 6.4 x 10-5 4.19 H2PO4- HPO42- 6.2 x 10-8 7.21 HCO3- CO32- 4.8 x 10-11 10.32 How many grams of the sodium salt of the weak acid must be combined with how many grams of the sodium salt of its conjugate...
You are asked to prepare 500. mL of a 0.300 M acetate buffer at pH 5.00...
You are asked to prepare 500. mL of a 0.300 M acetate buffer at pH 5.00 using only pure acetic acid (MW=60.05 g/mol, pKa=4.76), 3.00 M NaOH, and water. Answer the following questions regarding the preparation of the buffer. 1. How many grams of acetic acid will you need to prepare the 500 mL buffer? Note that the given concentration of acetate refers to the concentration of all acetate species in solution. 2. What volume of 3.00 M NaOH must...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT