For which of the salt in water, pH is independent of its concentration?

An angle whose measure is between 0 degrees to 90 degrees is called ______

If the sum of their measures is &nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>180</mn><mo>°</mo></math>. Then two angles are ______ angles.

If an angle measures &nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>69</mn><mo>°</mo></math>. What is the measure of its complementary angle?

&nbsp;How many endpoints does a line segment have?

For which of the salt in water, pH is independent of its concentration?

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