The reaction is carried out at pH 8, so we must balance in basic solution. I find it easiest to balance the equation as if it were in acid solution and then convert it to basic medium. Step 1. Write the two half-reactions. CH3CH2COO- → CH3COO- +HCO- 3 S → HS- Step 2. Balance all atoms other than H and O. Done. Step 3. Balance O by adding H2O molecules to the deficient side. CH3CH2COO ...
We're asked to find the molarity of the HCl in the gastric juice with some given titration data. First, let's write the balanced chemical equation for this neutralization reaction: NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l) Here's a hint we can use only in the special case of one-to-one molar ratios: M 1V 1 = M 2V 2 where M 1 and M 2 are the molarities of the two solutions V 1 and V 2 are the ...
2HCl +CrO3 → CrO2Cl2 + H2O If you add these equations together (and balance them out), you'll get the chemical equation that describes the overall reaction. I think that some chlorine gas can actually be produced here as a side-product of the reaction, but even if that happens this reaction will still qualify as your answer.
Changes in state are physical changes. Let's take water as an example. H2O. In the gaseous state, we sometimes call it steam or water vapor; it's chemical formula is still H2O. In the liquid state and in the solid state (ice), the chemical formula is H2O. In a physical change, the original substance is still there - it may be in a different state or shape, but there are no new substances ...