Propanoic acid has a Ka­ of 1.34 x 10^-5. What is the pH if 500 mL of 0.012 M propanoic acid solution is titrated with 250.00 mL of 0.010 M NaOH?

What is the molecular formula for a compound that is 46.16% carbon, 5.16% hydrogen, and 48.68% fluorine? the molar mass of the compound is 156.12 g/mol

What is the formula of the ionic compound composed of calcium cations and chloride anions

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?