Concentrated solution of HCl(%38 by mass)has a density of 1.19g/mL. a)calculate the mass of water H20 which is necessary to obtain 200g of 5% new HCl solution from the first solution.
b)What is the molar concentration of HCl in this concentrated solution?

Which element would mostly likely have an electron affinity measuring closest to zero

Which of the following are correct values for the ideal gas laws constant r

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.