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# If someone could please help that would be greatly appreciated:) 1

. 6.25g or HCI(g), a strong acid, is dissolved in water to make a 280-mL solution calculate the pH of the resulting solution. Step 1: calculate the number of moles of HCI(g) ________mol. Step 2: determine the number of moles of H3O+(aq) ________moles Step 3: determine the concentration of H3O+(aq) _______mol/L Step 4: calculate the pH _______ 2 . Calculate the mass of calcium hydroxide required to make a 500-mL solution with a pOH of 3.65. Step 1: calculate the hydroxide ion concentration. Express your answer in scientific notation ________ mol/L Step 2: calculate the concentration of calcium hydroxide. Express your answer in scientific notation______ mol/L Step 3: determine the number of moles of Ca(OH)2(aq). Express your answer in scientific notation_____ mol. Step 4: determine the mass of Ca(OH)2(s) ______mg. Use the following information to answer the remaining 3 questions ~ 9.0mL of 0.85 mol/L HBr(aq) is mixed with 12.0mL of water 3 . Given the information above, calculate the hydronium-ion concentration and pH of the resulting solution. The hydronium-ion concentration is____mol/L. The pH of the resulting solution is_____ 4 . 1.0 mL of the diluted solution is added to 9.0 mL of deionized water. Predict the pH of the resulting solution. ________ 5 . Suppose 1.0 mL of the solution from the previous question is added to 9.0 mL of deionized water. Predict the resulting pH without doing any calculation. Explain your reasoning.

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