A buffer solution is prepared by adding NaH2PO4 to a solution of H2PO4 (phosphoric acid).

H3PO4(aq) = H+ (aq) + H2PO4 (aq)

What happens if NaOH is added?

c (diamond),

sio2 (quartz)

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.