The benefits and facts of alkaline water are often skewed due to the marketing of companies and uneducated hype for the innocent idea of unlimited potential. I wanted to know the specific reactions occurring when mixing water and fresh lemon slices that lead to water becoming alkalized (higher in pH).

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    $\begingroup$ It doesn't and I have no idea why you'd think so. $\endgroup$
    – Mithoron
    Oct 5, 2016 at 23:27
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    $\begingroup$ I'm voting to close this question as off-topic because we don't do lists on chem.SE. $\endgroup$ Oct 5, 2016 at 23:39
  • $\begingroup$ I removed the reference to lists $\endgroup$
    – Curt F.
    Oct 6, 2016 at 1:01
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    $\begingroup$ Lemon water should be slightly acidic, not basic, due to the citric acid. $\endgroup$ Oct 6, 2016 at 2:30
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    $\begingroup$ @Todd A reaction mechanism is essentially a list of equations; the particular wording of a question should not play such a big role here. (the question even was tagged with reaction mechanism.) This question is not only very much on topic here, but also asking to fact check some the garbage science claims by the marketing industry. As a science community I believe it is our duty to clear up such claims with real facts. As a side note: "We don't do lists" is essentially the "too broad" close reason. I am voting to leave this question open. I will also upvote it. $\endgroup$ Oct 6, 2016 at 8:08

2 Answers 2


The claim that lemon water is alkaline is simply wrong. However, that hasn't stopped people from claiming that it's true:

Lemons are an incredibly alkaline food, believe it or not. Yes, they are acidic on their own, but inside our bodies they're alkaline (the citric acid does not create acidity in the body once metabolized). As you wellness warriors know, an alkaline body is really the key to good health.

Every sentence above is wrong. Lemons do not turn alkaline inside the body. They are not an alkaline food. Citric acid creates neither alkalinity nor acidity in the body when it is metabolized. An alkaline body is not the key to good health. In fact, if your body were more alkaline by only 0.5 pH units from its usual state, you would probably die from it.

I wanted to know the specific reactions that occur when mixing water and fresh lemon slices [...]

There aren't really many reactions that occur. Lemon juice is mostly water. Mixing the lemon juice present in lemon slices with more water just dilutes it. Lemon juice is acidic, due to the presence of citric acid and other acids. Diluting will very slightly lower the acidity. None of that has any relevance to the pH inside a mammalian body, which is exquisitely regulated by other mechanisms.

I don't know why people make up weird claims that lemons are an "alkaline" food, but those claims, sadly, are out there everywhere.

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    $\begingroup$ "I don't know why people make up weird claims that lemons are an "alkaline" food" Because they sell. The people marketing these stuff probably know that it's all rubbish. $\endgroup$ Oct 6, 2016 at 7:54

I’m an undergrad chemistry major, and I know some about the subject. The reason that people (falsely) believe that lemons somehow “turn alkaline” in the body is because drinking a lot of lemon juice slightly raises the pH of urine. The real reason this occurs is because the citric acid forms a buffer with citrate (which is found in the renal system I believe) and prevents urine from changing pH. It cannot change the pH of your blood. Nothing you eat changes your blood pH. If you eat a whole bunch of antacids (which are alkaline) you would neutralize your stomach acid and definitely have digestive issues, but it would not change your blood pH.


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