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Q: How many grams of HCl are needed to make 10 uL of a 0.005g/mL acid solution?
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What is the pH of the buffer 0.17 M Na2HPO4/0.25 M KH2PO4?
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- To make up a solution of phosphate buffered saline (PBS), you need 10 mM Na2HPO4 (anhydrous) (FW: 141.96 g/mol), 3 M NaCl (FW: 58.44 g/mol), and 5mM KH2PO4 (FW: 136.09 g/mol). How many grams of each will you need to make up 850 mL of PBS?What is the pH of the following buffer mixtures? (a) 100 mL 1 M acetic acid plus 100 mL 0.5 M sodium acetate (b) 250 mL 0.3 M phosphoric acid plus 250 mL 0.8 M KH2PO4What is the molarity of a NaOH solution if 48.0 mLneutralizes 35.0 mL of 0.144 M H2SO4?
- 50X TBE is 87 mM Tris-borate and 4 mM EDTA at pH 8.3. What is the molarity of each of the chemicals in 1X TBE buffer?Titration of a 12.0 mL solution of HCl requires 22.4 mL of 0.12 M NaOH. What is the molarity of the HCl solution?A 35 mL of solution of hydrochloric acid is neutralized by 15 mL of 0.5 M potassium hydroxide. What is the concentration of hydrochloric acid? The balanced equation is HCI + KOH - H,O + KCI O 0.75 M O 0.25 M O 0.214 M O 0.786 M
- In order to make a solution of the concentration 0.364 M, what mass of NaCl should bedissolved in 152 mL of water?What is the final concentration if 239mL of a 3.9M glucose solution is diluted to a volume of 842mL?You need to prepare an acetate buffer of pH 5.43 from a 0.621 M acetic acid solution and a 2.95 M KOH solution. If you have 730 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 5.43? The pKa of acetic acid is 4.76. Be sure to use appropriate significant figures.
- What is the molarity of a 30% solution of NaCIIf 4 mL of 1 M NaOH is added to 100 mL buffer, would it still be a usable buffer according to the conventions? Explain why or why not.Calculate the [OH-] and the pH of a solution with an [H] = 5.6 x 10-¹0 M at 25 °C. [OH-] = pH = Calculate the [H*] and the pH of a solution with an [OH-] = 0.059 M at 25 °C. pH = Calculate the [H] and the [OH] of a solution with a pH = 2.70 at 25 °C. [H*] = M