Orthoboric acid is 2.6% soluble in water at 40?C and ___________at 107°C.
Correct answer: C. 37%
- A. 26%
- B. 27%
- C. 37%
- D. <2.6%
Explanation
The solubility of orthoboric acid rises sharply with temperature, reaching about 37% at 107°C, compared with 2.6% at 40°C. Students may choose 26% by simply moving the decimal point or scaling 2.6 by ten, but the stated high-temperature solubility is approximately 37%.
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Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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