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Last updated date: 17th Jun 2024
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Answer
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Hint:An alkaline solution is a type of solution which is basic in nature or in other words an alkaline solution is supposed to have a $pH$ higher than seven.
When water is added to an acid, the concentration of the solution becomes dilute and it becomes less acidic than the original acid but it does not lose its acidity completely.

Complete step-by-step answer:Let us first consider how we could determine if a substance is alkaline or not. The best way is to measure the $pH$ of the solution. We will be discussing briefly about the acidity of substances and the relationship it has with pH scale.
If a substance is acidic in nature the molecules of that substance would release protons in the solution and the concentration of those released protons in the solution can determine the strength of that acid. Now, if we have a base, it will liberate hydroxide ions or it will decrease the concentration of protons in the solution as it will combine with the protons and form water molecules, hence the concentration of protons would decrease.
The $pH$ scale measures the concentration of protons in the solution and gives an idea about the nature of the solution. The $pH$ scale consists of $0-14$ where the minimum value represents most acidic, and the maximum value represents most basic and the middle value which is $7$ represents a neutral solution.
Now if we consider the question, we are asked if lemon water is alkaline. The word alkaline here means basic nature or the solution would have a $pH$ higher than seven. We know that lemon is acidic in nature as it contains citric acid and it is acidic in nature. However addition of water would dilute its acidity as compared to the original form, but still the $pH$ would remain less than seven. And so the solution would not be alkaline in nature.
So, the answer would be, no lemon water is not alkaline.

Note:The $pH$ scale is a type of scale which measures the concentration of protons which are present in the solution and gives an idea about the nature of the solution, as in it is acidic or basic.
The $pH$ scale consists of $0-14$ where the $0$ represents most acidic, and the $14$ represents the most basic and the middle value which is $7$ represents a neutral solution.