Calculate the concentration of hypo `(Na_(2)S_(2)O_(3)5 H_(2)O)` solution in g `dm^(-3)` of 10.0 ML of this solution decolourised 15 mL of `(M)/(40)` iodine solution

Explanation

To calculate the concentration of sodium thiosulfate (hypo), \( \text{Na}_2\text{S}_2\text{O}_3 \cdot 5\text{H}_2\text{O} \), in grams per dm³, we will follow these steps:

### Step 1: Write the balanced redox reaction
The reaction between iodine and sodium thiosulfate can be represented as:
\[ \text{I}_2 + 2 \text{Na}_2\text{S}_2\text{O}_3 \rightarrow 2 \text{NaI} + \text{Na}_2\text{S}_4\text{O}_6 \]
From the balanced equation, we see that 1 mole of \( \text{I}_2 \) reacts with 2 moles of \( \text{Na}_2\text{S}_2\text{O}_3 \).
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