25 cm 3 of sulphuric acid of concentration 0.2 mol dm^ -3 are needed to exactly neutralize 40 cm 3 of sodium hydroxide solution. What is the concentration of the
sodium hydroxide solution in mol dm ^-3 .

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.