Equal lengths of magnesium ribbons are taken in test tubes $A$ and $B$. Hydrochloric acid $(HCl)$ is added to test tube $A$, while acetic acid $(CH_3COOH)$ is added to test tube $B$. Amount and concentration taken for both the acids are same. In which test tube will the fizzing occur more vigorously and why ?
The fizzing will occur strongly in test tube $A$, in which hydrochloric acid $(HCl)$ is added.
This is because $HCl$ is a stronger acid than $CH_3COOH$ and therefore produces hydrogen gas at a faster speed due to which fizzing occurs.
Why should curd and sour substances not be kept in brass and copper vessels ?
Fresh milk has a $pH$ of $6$. How do you think the $pH$ will change as it turns into curd ? Explain your answer.
Why does dry $HCl$ gas not change the colour of the dry litmus paper ?
A milkman adds a very small amount of baking soda to fresh milk.
$(a)$ Why does he shift the $pH$ of the fresh milk from $6$ to slightly alkaline ?
$(b)$ Why does this milk take a long time to set as curd ?
You have been provided with three test tubes. One of them contains distilled water and the other two contaln an acidic solution and a basic solution, respectlvely. If you are glven only red litmus paper. how will you identify the contents of each test tube ?