Which of the following combinations would be the best to buffer the pH of a solution at approximately 7? A Na3PO4 and Na₂HPO4 (Ka= 4.8*10-13) B KCN and HCN (Ka= 6.17*10-10) H3PO4 and NaH2PO4 (Ka= 7.52*10-3) Na₂HPO4 and NaH2PO4 (Ka= 6.23*108)

Why is the pH of mixture D the same as the pH of mixture B? B 0.1 mol L–1 CH3COOH   Conductivity (mA)   5 PH 3 D Mixture made by mixing equal volumes of 0.2 mol L–1 HCl and 0.2 mol L–1 NaCH3COO Conductivity (mA) 80 pH 3

What ratio of CH₃NH₂ to CH₃NH₃⁺ is needed to prepare a pH 10.10 buffer? (Kb for CH₃NH₂ is 4.4 × 10⁻⁴)

The chemical 5-amino-2,3-dihydro-1,4- phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000 times. A basic solution of luminol is often sprayed onto surfaces that are suspected of containing minute amounts of blood. Luminol has a molecular weight of 177 g/mol. The forensic technician at a crime scene has just prepared a luminol stock solution by adding 17.0 g of luminol into a total volume of 75.0 mL of H₂O. What is the molarity of the stock solution of luminol? Express your answer with the appropriate units. ► View Available Hint(s) molarity of luminol solution = 1.28 M Submit Correct Part B Previous Answers Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00 × 10-2 M. The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many…

HC2H3O2 (aq) + H2O (l) <--> C2H3O2- (aq) + H3O+ (aq) Ka=1.8*10^-5 Calculate the pH of an acetic acid/ acetate buffer if the [HC2H3O2]=0.155M and the [C2H3O2^-]=0.380M

What ratio of CH₃NH₂ to CH₃NH₃⁺ is needed to prepare a pH 10.20 buffer? (Kb for CH₃NH₂ is 4.4 × 10⁻⁴)

16.19 A diprotic acid, H₂A, has the following ionization constants: K₁₁= 1.1 × 10¯³ and Kå,= 2.5 × 10¯6. Ka In order to make up a buffer solution of pH 5.80, which combination would you choose? NaHA/H₂A or Na₂A/NaHA.

Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is best suited for preparing a buffer solution with pH of 4.74?   Question 2 options:   NH3 / NH4Cl  (Ka = 5.6 × 10–10)   NaNO2 / HNO2  (Ka = 4.5 × 10–4)   CH3COONa / CH3COOH  (Ka = 1.8 × 10–5)   NaCl / HCl   NaOCl / HOCl  (Ka = 3.2 × 10–8)

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What is the pH of a buffer solution made by adding 0.41 g of NaC2H3O2 to 100. mL of 0.10 M HC2H302? Molar mass of NaC2H3O2 = 82.0 g/mol Ka of HC2H3O2 = 1.8x10-5 pH of buffer [?] pH of Buffer Enter