Ocument 10.
A buffer solution is based on methanoic acid, HCOOH (K = 1.70 x 10-4 mol dm3) and
methanoate ions, HCOO-.
I
In the buffer solution, the HCOOH concentration is half the HCOO-concentration.
What is the pH of the buffer solution?
A. 2.47
B. 3.07
C. 3.47
D. 4.07
Your answer
[1]

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

10 years is the answer

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.