2 years ago

What is the effect of the room temperature on how well s student does on a test

1 answer:

4 0

Temperature has been shown to have a tremendous impact on student performance, and it all begins with altering our mood. Temperature’s effect on mood decreases memory and cognitive ability which is what affects learning ability. Data collected from a study done by the University of Scranton reveals that students perform best in controlled temperatures with test scores averaging in the 90th percentile. When temperatures were too hot scores averaged in the low 70s, and at the mid-70s when they were too cold.

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Acetic acid is a weak acid with a pKa of 4.76. What is the concentration of acetic acid in a buffer solution of 0.2M at pH 4.9.

masya89 [10]

Answer:

0.084 M

Explanation:

Using the Henderson-Hasselbalch equation for a buffer ( a buffer is solution contain a weak acid and it conjugate base; the solution resist change in pH)

pH = pKa + log ( base/acid)

4.9 - 4.76 =log ( base / acid)

10^0.14 = ( base / acid)

1.38 = (base / acid)

since there is 0.2 M in the buffer solution

the concentration of acid = $\frac{1}{(1+1.38)}$ × 0.2 = 0.084 M