In an acid-base titration experiment, 50 mL of a 0.05 M solution of acetic acid (Ka = 1.75 x 10-5 ) was titrated with a 0.05M solution of NaOH at 25 oC. The system will acquire this pH after addition of 40 mL of the titrant:

Answer: 5.36

How do you solve this?

1. Design either a randomized controlled double blind experiment on a particular study of interest OR design a matched pairs study. State how you have been able to eliminate bias in your study.

Be highly specific in your answer. Your answer must be at least 8 COMPLETE sentences in length.

Draw a flow diagram for the separation of benzoic acid, phenol, and naphthalene. Enough detail must be included for someone to perform the experiment, however, you do not need to include masses or volumes

( this question pertains to acid/base extractions, ect. ) Please be neat, as I seek guidance and mastery, thank you.

1. The randomized control clinical trial is the standard by which all trials are judged since other designs have certain undesirable fe
   1. Why is randomization an important feature in a controlled experiment? List the advantages of a randomized controlled trial.
   2. What is the definition of a confounding variable? How does randomization mitigate this problem?

Hydrocarbon Lab Post-Question:

Two of the compounds in this experiment had similar odors, yet their molecular structures are very different. Comment on factors at the molecular level that may be involved in the mechanism of smell. (Assume that a nerve impulse to the olfactory center of the brain is initiated by interaction of molecules, in this case the hydrocarbons, with a receptor in the nose.)

Managers of the New Hope and Ivyland Short Line Railroad conducted and experiment in which they reduced fares by about 28% for approximately a year to estimate the price elasticity of demand. This large fare reduction resulted in essentially no change in the railroad’s revenues.

Take a face value, what seemed to be the price elasticity of demand?

1. In the experiment of rolling a balanced die twice. Let X be the minimum of the two numbers obtained and Y be value of the first roll minus the value of the second roll. Determine the probability mass functions and cumulative distribution functions of X and Y, and sketch their graphs

please also solve probability for Y

One method for preparing alcohols involves hydration of alkenes with aqueous acids (such as sulfuric acid and water). In light of this fact, it seems surprising that the phosphoric acid promotes the elimination of cyclohexanol to give cyclohexene plus water at high temperatures, the very components required to make cyclohexanol. Why was your experiment successful?

In an experiment, why would the concentration of a sample decrease when changing the wavelength for a spectrophotometer from 235 nm to 280 nm?