Please explain how significant figures for natural logs are found?

• Pt / H2(g, I atm), H+(aq, 1M) // H2(g, 1atm),H+(aq,?) / Pt If the Ecell =-0.487 V in this reaction am I able to find the pH of the cathode solution?

• Two glasses labeled A and B contain equal amounts of water at different temperatures. Kim put an antacid tablet into each of the two glasses. The table shows

• 1.02 g NaNO 2 powder with 97 % purity was used to make 5000 micromol/kg solution (3000 g) with DI water. Should purity be considered when you calculate the