2018年2月27日 · "Limes" that are the green, hybrid citrus fruits are acidic with citric acid, just like lemons. Both have juice with a pH in the range of 2-3, for limes as in fruit a typical pH level is about 2.8. Hence the tart flavor for which both fruits are known. Like all citrus fruits, lemons and limes are a rich source of ascorbic acid, vitamin C.

2016年10月6日 · 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.

Lemon juice is weakly acidic (hence its sour taste) and milk is slightly basic (or alkaline, the terms are used interchangeably). A sugar solution is completely neutral since sugar can't take hydrogen ions out of the water or donate them in.

2019年10月20日 · Lemon: The pH range of lemon is 2.00 to 2.60. This makes lemon slightly less acidic than lime. 'The pH levels of citrus fruits can cause damage to tooth enamel. Typically, the lower the pH, the more damage is done to the teeth. Oranges have a higher pH level, at 4.35, and are less damaging to teeth than lemons at 2.75, limes at 2.88.'

2022年11月7日 · After looking at the link you posted, it seems "% acidity" refers to the mass percentage of citric acid in lemon juice, which is approximately 6%. The percent acidity of your lemonade will depend on the percentage of lemon juice that constitutes it.

2016年11月23日 · For example, when making lemonade: will mixing sugar in water after adding lemon juice lead to a slower sugar dissolving rate, than if sugar were mixed in before adding lemon juice?

2014年5月29日 · A pH of 5 is about the same as a cup of black coffee, and is about one hundred times less acidic than orange juice. I also found this article which describes another interesting effect - the bacteria that was used in the first experiment actually starts producing ethanol as a fermentation product under acidic conditions, instead of just lactose.

It's somewhat contradictory to discuss pH as -log[H+], and then say that pH = -3.6 is possible. There is no way you can cram over 1000 moles of hydronium ions into a liter! The -3.6 value only makes sense if you explain that pH = - log (H+ activity), and that it is the deviation of activity from concentration that makes the value -3.6 possible.

2018年4月22日 · The pH of lemon juice is about 2.1. What is the citric acid concentration, [HCit], in the lemon juice?

2019年5月13日 · There are two cases, both related to acid-base reactions. Both are also partial reasons why so many fish recipes use lemon juice. Fish, especially sea fish, naturally contain trimethylamine-N-oxide $\ce{(CH3)3N-O}$ that, after death, gets enzymatically reduced to trimethylamine $\ce{(CH3)3N}$, the source of the ammonia-like fish odour.