PRAKTIKUM (1) FAKTOR-FAKTOR YANG MEMPENGARUHI LAJU REAKSI (KONSENTRASI)

Summary

In this science experiment, students explore how concentration affects the rate of reaction. The instructor demonstrates using hydrochloric acid (HCl) with different molar concentrations (1M, 2M, 3M) and magnesium strips. They measure the time it takes for the magnesium to completely react with each concentration of HCl. As the concentration increases, the reaction time decreases. The experiment shows that higher concentration speeds up the reaction. Key variables include the concentration of HCl (independent variable), reaction time (dependent variable), and controlled variables such as magnesium strip length and experiment setup.

Takeaways

• 🧪 The experiment demonstrates the factors that affect reaction rates, focusing on concentration.
• 🧴 Different concentrations of HCl (1M, 2M, and 3M) are used to observe their effect on magnesium ribbon reactions.
• ⏲️ In the experiment, a stopwatch is used to measure the time it takes for magnesium to completely react with each concentration of HCl.
• ⏳ The 1M HCl takes about 7 minutes for the magnesium ribbon to fully react.
• ⏳ The 2M HCl takes around 5 minutes for the magnesium ribbon to fully react.
• ⏳ The 3M HCl takes approximately 1 minute for the magnesium ribbon to fully react.
• 💡 The conclusion is that higher HCl concentrations lead to faster reaction rates.
• 🧩 Variables in the experiment include the independent variable (HCl concentration), dependent variable (reaction time), and control variables (other factors kept constant).
• 🔬 The formation of hydrogen gas (H2) is observed as a byproduct during the reaction between magnesium and HCl.
• 📊 The experiment confirms that increased concentration results in a faster reaction rate due to higher particle collision frequency.

Q & A

What is the main topic of the experiment in the transcript?

The main topic of the experiment is the factors that influence the rate of reaction, with a specific focus on how the concentration of hydrochloric acid (HCl) affects the reaction rate with magnesium strips.

Which substances are used in this experiment?

The substances used in the experiment are hydrochloric acid (HCl) with different concentrations (1M, 2M, and 3M) and magnesium strips.

What is the purpose of using HCl with different concentrations in the experiment?

The purpose of using HCl with different concentrations is to observe how the concentration of a reactant (HCl) affects the rate at which the magnesium reacts and the time it takes for the magnesium to completely dissolve.

How is the magnesium introduced into the experiment?

Magnesium is introduced in the form of thin magnesium strips, which are placed into the hydrochloric acid solution to react with it.

What tools are used in this experiment?

The tools used in the experiment include a measuring cylinder, beakers, petri dishes, and a stopwatch.

How long does it take for magnesium to completely react in 1M HCl?

It takes around seven minutes for the magnesium to completely react in 1M HCl.

What is the observed reaction time for magnesium in 2M HCl?

The magnesium takes about five minutes to completely react in 2M HCl.

How fast does magnesium react in 3M HCl?

In 3M HCl, the magnesium reacts very quickly, taking approximately one minute to completely dissolve.

What gas is produced during the reaction between magnesium and HCl?

Hydrogen gas (H2) is produced during the reaction between magnesium and HCl.

What is the relationship between concentration and reaction rate as observed in the experiment?

The experiment shows that the higher the concentration of HCl, the faster the reaction rate, meaning that increasing concentration results in a shorter reaction time for the magnesium to dissolve.