Answer:
1) pH = 1.0
2) pOH = 6.09
3) pOH = 9.26 ; pOH = 8.88 ; pH = 1.22
Explanation:
1) What is the pH of a solution with [H₃O⁺] of 9.1 x 10⁻² M?
pH = -log ( [H₃O⁺] ) = - log (9.1 x 10⁻²) = 1.0
2) What is the pOH of a solution at 25 °C when the pH is 7.91?
pH + pOH = 14
pOH = 14 - pH = 14 - 7.91 = 6.09
3) Which of the following is acidic at 25 °C?
A solution is acidic when the pH is below 7
pOH = 9.26 → pH = 4.72 <em>ACIDIC</em>
pOH = 8.88 → pH = 5.12 <em>ACIDIC</em>
pOH = 6.45 → pH = 7.55
pH = 1.22 <em>ACIDIC</em>
pH = 9.41
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The two ways the cathode ray tube experiment changed scientists'
understanding of the atom was it showing that atoms can be divided into
smaller parts and all atoms contain electrons.
J.J Thompson was the scientist which performed the cathode ray tube
experiment and was able to ascertain it was negatively charged as a result
of it being deflected to the positive electrode.
His observation showed that the atoms contain sub-atomic particles called
electrons which are negatively charged.
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