Question

dilution of an acid solution lowers the ph. *
true
false

which piece of lab equipment is used for measuring a precise volume of the final solution? *
erlenmeyer flask
beaker
volumetric flask
test tube

which of the following does not dissolve very well in water? *
sodium chloride
sugar
ethanol
gasoline

Explanation:

1. For the first question: Diluting an acid increases the volume of solvent, decreasing the concentration of H⁺ ions. Higher H⁺ concentration means lower pH, so reducing H⁺ concentration raises the pH, making the statement false.
2. For the second question: Volumetric flasks are calibrated to hold a precise fixed volume at a specific temperature, designed for preparing solutions with exact final volumes. Other listed glassware only estimates volumes.
3. For the third question: Water is polar; substances with similar polarity dissolve well (like dissolves like). Gasoline is nonpolar, so it does not dissolve well in polar water, while the other options are polar or polar-compatible and dissolve easily.

Answer:

1. False
2. volumetric flask
3. gasoline