Suppose 24.0 mL of 0.20M hydrochloric acid requires 42.7 mL of NaOH to reach the endpoint. What is the molarity of the base solution?

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

Select all that apply. using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 (s) pb+2(aq) + 2cl -(aq). the concentration of the products yield a ksp of 2.1 x 10-2:

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit