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Problem- How do I calculate the Rf values from TLC if there are three spots from the crude product and one from the pure product?
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Find a corresponding criterion for processes at constant V and T. The new thermodynamic variable that is used to express this criterion is called the Helmholtz free energy
what happens to the entropy of the system upon opening the valve between the flasks? 1. The entropy remains the same. 2. There is too little information to assess the change. 3. The entropy decreases. 4. The entropy increases.
What is the pH of a solution prepared by dissolving 4.1g of HCl in water to make 455mL of HCl solution?
A 20.0-mL sample of 0.25 M HNO3 is titrated with 0.15 M Na OH. What is the pH of the solution after 30.0 mL of NaOH have been added to the acid?
What are the values of [H+], [H2PO3-], and [HPO32-] in a 3.0 M solution of H3PO3? What is the pH of the solution?
calculate the formal charge on the indicated atom in each of the following molecules or ions. some molecules may have
A 10mL sample of aquarium water was treated with reagents to form a colour, and after dilution to 100 mL was found to have an absorbance of 0.162. calculate the concentration in ppm of nitrite in the aquarium water.
Determine the energy of an electron in the given quantum level of each of the following ions. (Hint: Each of the ions has a different number of protons
What pressure is needed to confine an ideal gas to 193.0 L after it has expanded from 11.0 L and 0.9 atm at constant temperature
What volume of 16M HNO3 will be needed to prepare 250mL of 0.50 M HNO3
A 250.0-mL sample of water was adjusted to pH 10 with ammonia buffer and calmagite indicator was added. The prepared sample required 30.84 mL of 0.00802 M EDTA for titration to the endpoint. Calculate the hardness as ppm CaCO3
Using the Henderson-Hasselbalch equation, calculate the pH of an ammonia buffer when the NH3:NH4+ ratio is 0.4 moles:0.6 moles. (pK = 9.75). Please explain and will rate lifesaver.
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