Which of these is a property of acids?

1. they feel slippery.

2. they turn litmus paper blue.

3. they taste sour.

4. they typically contain an -oh group.

What shape would a molecule with two bound groups and two lone pairs have?

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.