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### Topic: Homework Help  (Read 3656 times)

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#### aamuller

• Very New Member
• • Posts: 2
• Mole Snacks: +0/-0 ##### Homework Help
« on: November 30, 2007, 04:40:49 PM »
Hello, If you can please tell me how to find these answers.

find the pH of a solution containing 6 g HCl in 0.25 L of solution

find the ph of 0.15 M Ba(OH)2

find the pH of 0.5 L of HCl solution with a pH of 1.72 to a final volume of 1L

find the pH of 35. mL of 0.5 M HClO4 and 45mL of 0.600 M KOH

2. find amount of acid or base needed to prepare each solution

how many mL of M HNO3 is needed to prepare 1.0 L of 0.25 M HNO3

How many grams of HF to prepare 500 mL of 0.1M HF solution

How many grams of NaOH to prepare 200 mL of 2.5 M NaOH

3. Determine the pH of a solution when 100 mL of 0.50 M NH3 is mixed with 200 mL of 0.300 M NH4Cl

4. What is the pH if 0.01 mol of HCl were added to the solution in part 3?

5. A styrofoam cup calorimeter contains 150 grams of H20. the addition of 1430 J of heat produced a temp rise of 1.93 degree C. this date was used to calculate the calorimeter heat capacity: C cal=114 J /C. The dissolution of a small amount of salt in 150 grams of water caused the initial temp of 25 degree C to rise to 29.36 degree C. Calculate the q for the dissolution of salt. you may assume that the mass of the solution is 150 grams and that the heat capacity of the solution of water + salt is 4.184 J/g Celsius

#### Borek ##### Re: Homework Help
« Reply #1 on: November 30, 2007, 05:48:53 PM »
Please read forum rules. We will be eager to help once you will try by yourself.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

#### aamuller

• Very New Member
• • Posts: 2
• Mole Snacks: +0/-0 ##### Re: Homework Help
« Reply #2 on: December 01, 2007, 02:11:30 PM »
But I'm really not sure how to start the first set. And for the last one the answer I got was -2956.35J. But I'm not sure that is correct.

#### Borek ##### Re: Homework Help
« Reply #3 on: December 01, 2007, 03:23:51 PM »
Use pH definition.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info