Is a solution that is 0.5 M HBr and 0.50 M KBr a buffer? Explain your thinking?

Within what pH range is a HOCl – NaOCl buffer effective? Answer: pH 6.5 – pH 8.5 (Please explain. Thank you.)

Please fast and correct answer.

You need to prepare an acetate buffer of pH 5.19 from a 0.747 M acetic acid solution and a 2.49 M KOH solution. If you have 880 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 5.19? The p?a of acetic acid is 4.76. Be sure to use appropriate significant figures.          Please type answer note write by hend.

I dont know these two questions. Please answer both

I need help calculating the concentration of acid in each buffer solution show in the second picture!!!!   EXPERIMENTAL DATA Sample HIn (mL) 1.10 M Acetic Acid (mL) 0.90 M Sodium Acetate (mL) 1 10.00 8.00 2.00 2 10.00 7.00 3.00 3 10.00 6.00 4.00 4 10.00 5.00 5.00 5 10.00 4.00 6.00 6 10.00 3.00 7.00 7 10.00 2.00 8.00 8 10.00 1.00 9.00 9 10.00 10.00 mL NaOH (0.10 M) 10 10.00 10.00 mL HCl (0.10 M)

3. Please answer parts A-C and show all work, thank you!! :)

Calculate the concentration of acid in each buffer solution. The pKa of acetic acid is 4.745

Solve correctly please. (Gpt/Ai wrong answer not allowed)

Please solve fast!