the first part of this experiment, sodium percarbonate will be dissolved in water: Na2CO3·n H2O2(s) → 2 Na+(aq) + CO32–(aq) + n H2O2(aq) The hydrogen peroxide thus generated will be consumed by iodide and sulfuric acid: H2O2(aq) + 2 H+(aq) + 3 I– → 2 H2O(l) + I3–(aq) Finally, the triiodide anion will be consumed by added thiosulfate: 2 S2O32–(aq) + I3–(aq) → S4O62–(aq) + 3 I–(aq) Considering these chemical equations, if 0.416 millimoles (mmol) of thiosulfate were needed to completely consume all of the triiodide generated in reaction 2, how many millimoles of hydrogen peroxide were present in the original sodium percarbonate sample? Enter your response to the nearest 0.001 mmol
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
In the first part of this experiment, sodium percarbonate will be dissolved in water:
Na2CO3·n H2O2(s) → 2 Na+(aq) + CO32–(aq) + n H2O2(aq)
The hydrogen peroxide thus generated will be consumed by iodide and sulfuric acid:
H2O2(aq) + 2 H+(aq) + 3 I– → 2 H2O(l) + I3–(aq)
Finally, the triiodide anion will be consumed by added thiosulfate:
2 S2O32–(aq) + I3–(aq) → S4O62–(aq) + 3 I–(aq)
Considering these chemical equations, if 0.416 millimoles (mmol) of thiosulfate were needed to completely consume all of the triiodide generated in reaction 2, how many millimoles of hydrogen peroxide were present in the original sodium percarbonate sample? Enter your response to the nearest 0.001 mmol.
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