A student is trying to identify an unknown substance by finding its density. He finds the mass of a weighing boat to be 2.69 g and the mass of the unknown pieces, including the weighing boat, to be 18.01 g. To find the volume he measured out 25.7 mL of water in a graduated cylinder and then added the pieces to find a new measurement of 32.3 mL

What are transitions between a liquid and a solid called? identify which way they are transitioning

Asolid that forms and separates from a liquid mixture is called

Answer asap need 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.