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Problem- A buffer that contains 0.3 M of a base, B and 0.16 M of its conjugate acid BH+, has a pH of 9. What is the pH after 0.03 mol of Ba(OH)2 are added to 0.63 L of the solution?
State your answer by means of three significant figures.
Calculate the pOH of a solution that results from mixing 27 mL of 0.11 M ethylamine (C2H5NH2) with 45 mL of 0.11 M C2H5NH3Cl.
The pH of 0.05 M benzoic acid is 2.24. Calculate the change in pH when 2.45 g of C6H5COONa is added to 20 mL of 0.50 M benzoic acid, C6H5COOH. Ignore any changes in volume. The Ka value for C6H5COOH is 6.5 x 10-5.
What is the sign of the entropy change for the heat transfer. You probably know that when two objects at different temperatures are brought into contact, heat always travels from the hotter object to the colder object; never the reverse.
Degraded state is detected with probability 0.9 (failed state with probability 1) and repair occurs in both degraded and failed states. Repair starts immediately upon detection of the failed or degraded state and restores the system to the oper..
2. The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people used the new toothpaste for 6 months. The mean number of cavities at their next checkup is 1.5. In the ge..
Study investigates whether there are differences in the outcomes of three different treatments for anxiety. The treatment conditions that are compared are treatment with medication, treatment with psychotherapy, and placebo (inactive pills). ..
What do the Fitted (predicted) values and Residuals represent? For example, there is one record in the data set with height = 54 and weight = 110. Please use these numbers to explain what is the fitted value and what is the residual.
The tosylate of (2S,3R)-4-methyl-3-phenylpentan-2-ol undergoes an E2 elimination on treatment with sodium ethoxide. Draw the structure of the alkene that is produced.
What is the mol% of Pd used in this reaction. ex: 5% mol% catalyst means that the reaction uses 5% as much catalyst as limiting reactant
Jeremy is an eight year old boy that is experiencing problems at home and at school. While at home, his mother often complains that he is very messy, disorganized, and is frequently interrupting others. At school, his teachers report that he i..
question a 158.5 mg sample of pure cu metal is dissolved in a small amount of concentrated nitric acid giving cu2 ions
Determine the number of grams of sodium acetate and the amounts in mLs of 6.00M acetic acid that you would need to make 50.00mL of a sodium acetate/acetic acid buffer solution at the pH equal to 5.00 in order to make a final concentration of 0.05M..
How many neutrons are there in an atom of lead whose mass number is 208? A) 82 C) 208 E) none of them B) 126 D) 290 8. Atoms of the same element with different mass numbers are called A) ions. C) allotropes. E) isotopes. B) neutrons. D) chemical f..
How many grams of pyridine are there in 100 mL of an aqueous solution that has a pH of 9.00? The Kb for pyridine is 1.9x10^-9
A system at equilibrium contains I2(g) at a pressure of 0.16 atm and I(g) at a pressure of 0.20 atm. The system is then compressed to half its volume
Question- Consider a "normal" carbon monoxide molecule (^12C^16O) in its ground electronic level and having the rotational quantum number J = 20 and the vibrational quantum number v =5 . Use the rigid rotor and harmonic oscillator models for descr..
Calculate the potential at a platinum electrode in the titration of 50.0 mL of 0.100 M FeSO4 after addition of 7.00 mL of 0.0500 M KMnO4.
A gas chromatogram of the organic components of a sample of beer using a column that separates compounds on the basis of their relative boiling points provides a GLC trace with several peaks. Two of the smaller peaks, with retention times of 9.56 ..
fe2o3 2al - 2fe al2o3if you start with 50.0g of iron iii oxide and 25.0 g ofaluminum in the above problem what is the
Given that the specific heat capacities of ice and steam are 2.06 j/g degrees C and 2.03J/g degrees C, respectively, calculate the total quantity of heat evolved when 10.0 g of steam at 200 degrees C is condensed, cooled, ad frozen to ice at -50 d..
Give the products you would expect and the mechanism involved for the reaction of 1-bromopropane with:a. Water
Classify the set of solutions based on the movement of solvent from the first solution listed to the second solution listed as osmosis or reverse osmosis.
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