Question

Mg ribbon was wound up and suspended in the open end of a 50-mL buret. The buret was inverted into a beaker containing 100 mL of water. Vacuum was used to suck the air out of the tip of the buret, filling it with water from the beaker. Air was then allowed in through the tip of the buret until the water level decreased to the 50.00-mL mark. 100 mL of 6 M HCl was added to the beaker. After the magnesium ribbon was completely reacted, the water level was read. The difference between the two readings was the volume of the hydrogen gas produced.

Suppose that at the end of Reaction 1 the level of the aqueous solution were 26 cm higher inside the buret than outside. Compared to ambient pressure, the pressure of the gas inside the buret would be:
A. lower.
B. the same.
C. 2 times greater.
D. 26 times greater.

Answer 1

The pressure of the gas inside the buret is higher than the ambient pressure due to the 26 cm water column above the buret's water level, which increases the gas pressure by the weight of the water column, not 26 times greater.

option c is correct

Step-by-step explanation:

option c is correct If the level of the aqueous solution inside the buret is 26 cm higher than outside, this implies that the pressure exerted by the column of water must be counterbalanced by the pressure of the gas inside the buret. Given that the external pressure is ambient, and there is an additional pressure due to the 26 cm column of water inside the buret, it follows that the pressure of the gas inside the buret is higher than the ambient pressure.

The additional pressure is due to the weight of the water column. The pressure exerted by a column of liquid in equilibrium is equal to the height (h) of the column multiplied by the density (ρ) of the liquid and the acceleration due to gravity (g), which is represented by the formula P = hρg. Since the pressure inside is supporting a 26 cm water column that the ambient pressure is not, we can conclude that the pressure of the gas inside the buret is higher than the ambient pressure but not 26 times greater; rather, it is increased by the amount equivalent to the weight of the 26 cm column of water.

The pressure of the gas inside the buret compared to ambient pressure would be 2 times greater.

Based on the given information, the aqueous solution inside the buret is 26 cm higher than outside. The difference in height can be attributed to the pressure exerted by the gas in the buret. By using the relationship between pressure and height of a liquid in a column, we can calculate the pressure difference.

Using the equation P = dgh, where P is pressure, d is density, g is acceleration due to gravity, and h is height, we can compare the pressure inside and outside the buret. Since the density and acceleration due to gravity are the same for both regions, the pressure inside the buret would be 2 times greater than ambient pressure.