The experiment is to measure the rate of alka-seltzer tablet dissolution. One ta

Question

The experiment is to measure the rate of alka-seltzer tablet dissolution. One tablet in each glass of 200 ml. of water. There is an ice-cold glass, a hot tap water glass, and a room temp. glass. These are the questions I need help with for the second part:

1. What variable was not completely controlled during the experiment, and what could have been changed to make this variable more constant?

2. List five questions about the rate at which Alka-Seltzer® tablets dissolve. Think about the controlled variables. What would happen if temperature was held constant and one of the controlled variables were changed? (Hint: What other than water temperature could affect the rate at which the tablets dissolve?)

3. Develop a new hypothesis based on one of the questions. Remember that a hypothesis must be testable with empirical or measurable data.

This is what I wrote for the first part of the experiment:
What are the independent and dependent variables?

Independent- water temperature

Dependent- time of dissolution

Define at least three controlled variables.

Amount of water in each glass

Type of glass

Alka-Seltzer tablets

State your hypothesis for today’s experiment as an “if/then” statement.

If the temperature of the water is increased then the Alka-Seltzer tablet will dissolve faster.

Explanation / Answer

C6H8O7 (s) 3H+ (aq) + C6H5O7 3- (aq

sodium bicarbonate will dissolve in water as

NaHCO3 (s) Na+ (aq) + HCO3 - (aq)

the hydrogen and bicarbonate ions collide to form the carbonic acid , the carbonic acid readily dissolve in water to form carbon dioxide and water . the above reaction occurs only if the hydrogen and bicarbonate ions are easily dissolved in a solution. these dont occur if they are in solid state .

1. What variable was not completely controlled during the experiment, and what could have been changed to make this variable more constant?

temperature was not completely controlled during the experiment . the best temperature for effective room temperature . cold water will make it slowly dissolute and warm water may make it foam .

2. List five questions about the rate at which Alka-Seltzer® tablets dissolve. Think about the controlled variables. What would happen if temperature was held constant and one of the controlled variables were changed?

the rate of chemical reaction depends on number of factors like temperature ,particle size ,concentration of the reactants , nature of reactants and presence of catalyst .

What would happen if temperature was held constant and one of the controlled variables were changed?

in order to chemichal reaction to occur reactant molecules must collide while reactant partcles with proper energy and orientation . by increasing the surface area of the reactants ,more particles may collide thus increase the reactant rate .higher the reactant ,will alllow more partcles to collide .

Develop a new hypothesis based on one of the questions. Remember that a hypothesis must be testable with empirical or measurable data.

the hypothesis developed is based on the collision theory . the rate of reactants how they will collide .

experiment ;

aim ; is to explore the list of variables that will affect the rate of reaction .which include the size of tablet ,temperature of water ,volume of water ,size of container .stirring

procedure ;

the condition and variable we took is the temperature , cold ,warm and tap water .

the hypothesis developed is the collision theory ;

increased temperature means the average kinetic energy of the system is increased , therefore increase in the particle size more energitic will increase the rate at which products are produced .

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.