dilute NaOH solution is added to a pale
dilute NaOH solution is added to a pale
dilute NaOH solution is added to a pale
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No precipitate appears when two drops of <strong>dilute</strong><br />
<strong>NaOH</strong> <strong>solution</strong> <strong>is</strong> <strong>added</strong> <strong>to</strong> a clear <strong>solution</strong>. More<br />
<strong>NaOH</strong> <strong>is</strong> <strong>added</strong> and when heated the gas emitted<br />
turns red litmus paper blue.<br />
What <strong>is</strong> the gas produced?<br />
Write an equation for the production of the gas.<br />
An orange <strong>solution</strong> produces an orange/brown<br />
precipitate when <strong>dilute</strong> sodium hydroxide <strong>solution</strong><br />
<strong>is</strong> <strong>added</strong>. If a <strong>solution</strong> of potassium thiocyanate <strong>is</strong><br />
<strong>added</strong> <strong>to</strong> the original <strong>solution</strong>, a dark red <strong>solution</strong><br />
<strong>is</strong> formed.<br />
Name the ion present.<br />
Give the equations for the production of the<br />
precipitate and the red compound.<br />
A <strong>solution</strong> turns red litmus paper blue. When<br />
<strong>dilute</strong> HCl <strong>is</strong> <strong>added</strong> bubbles of gas are observed.<br />
Write an equation which shows which gas <strong>is</strong><br />
produced.<br />
An orange <strong>solution</strong> produces an orange/brown<br />
precipitate when <strong>dilute</strong> sodium hydroxide <strong>solution</strong><br />
<strong>is</strong> <strong>added</strong>. If a <strong>solution</strong> of potassium thiocyanate <strong>is</strong><br />
<strong>added</strong> <strong>to</strong> the original <strong>solution</strong>, a dark red <strong>solution</strong><br />
<strong>is</strong> formed.<br />
Name the ion present.<br />
Give the equations for the production of the<br />
precipitate and the red compound.
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