A student completes a titration by adding 25.0mL of NaOH of unknown concentration to 35.0mL of 0.25M HCl. What is the molar concentration of NaOH? If it takes 15 mL of 0.5M sodium hydroxide solution to neutralize 200 mL of Hydrochloric acid, what is the concentration of HCl?

THIS IS TIMED (please show work) WILL VOTE BRAINLIEST.

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!