Alkaline water: if you like it, why not make your own?

Me* reading the comments section on the Amazing Alkaline Lemons post (*not actually me)

Alkaline water seems to be a trend at the moment. Not quite so much in the UK, yet, but more so in the US where it appears you can buy nicely-packaged bottles with the numbers like 8 and 9.5 printed in large, blue letters on their sides.

It’s rather inexplicable, because drinking slightly alkaline water does literally NOTHING for your health. You have a stomach full of approximately 1 M hydrochloric acid (and some other stuff) which has an acidic pH of somewhere between 1.5 and 3.5. This is entirely natural and normal – it’s there to kill any bugs that might be present in your food.

Chugging expensive water with an alkaline pH of around 9 will neutralise a bit of that stomach acid (bringing the pH closer to a neutral value of 7), and that’s all it will do. A stronger effect could be achieved with an antacid tablet (why isn’t it antiacid? I’ve never understood that) costing around 5p. Either way, the effect is temporary: your stomach wall contains special cells which secrete hydrochloric acid. All you’re doing by drinking or eating alkaline substances is keeping them busy.

(By the way, I’m not recommending popping antacids like sweeties – it could make you ill with something called milk-alkali syndrome, which can lead to kidney failure.)

Recently, a video did the rounds of a woman testing various bottled waters, declaring the ones with slightly acidic pHs to be “trash” and expressing surprise that several brands, including Evian, were pH neutral. The horror. (For anyone unsure, we EXPECT water to have a neutral pH.)

Such tests are ridiculous for lots of reasons, not least because she had tiny amounts of water in little iddy-biddy cups. Who knows how long they’d been sitting around, but if it was any length of time they could well have absorbed some atmospheric carbon dioxide. Carbon dioxide is very soluble, and it forms carbonic acid when it dissolves in water which, yes, would lower the pH.

Anyway, there’s absolutely nothing harmful about drinking water containing traces of acid. It doesn’t mean the water is bad. In fact, if you use an ion exchange filter (as found in, say, Brita filter jugs) it actually replaces calcium ions in the water with hydrogen ions. For any non-chemists reading this: calcium ions are the little sods that cause your kettle to become covered in white scale (I’m simplifying a bit). Hydrogen ions make things acidic. In short, less calcium ions means less descaling, but the slight increase in hydrogen ions means a lower pH.

So, filtered water from such jugs tends to be slightly acidic. Brita don’t advertise this fact heavily, funnily enough, but it’s true. As it happens, I own such a filter, because I live in an area where the water is so hard you can practically use it to write on blackboards. After I bought my third kettle, second coffee machine and bazillionth bottle of descaler, I decided it would be cheaper to use filtered water.

I also have universal indicator strips, because the internet is awesome (when I was a kid you couldn’t, easily, get this stuff without buying a full chemistry set or, ahem, knowing someone who knew someone – now three clicks and it’s yours in under 48 hours).

The pH of water that’s been through a (modern) ion-exchange filter tends to be slightly acidic.

The water in the glass was filtered using my Brita water filter and tested immediately. You can see it has a pH of about 5. The water straight from the tap, for reference, has a pH of about 7 (see the image below, left-hand glass).

The woman in the YouTube video would be throwing her Brita in the trash right now and jumping up and down on it.

So, alkaline water is pretty pointless from a health point of view (and don’t even start on the whole alkaline diet thing) but, what if you LIKE it?

Stranger things have happened. People acquire tastes for things. I’m happy to accept that some people might actually like the taste of water with a slightly alkaline pH. And if that’s you, do you need to spend many pounds/dollars/insert-currency-of-choice-here on expensive bottled water with an alkaline pH?

Even more outlandishly, is it worth spending £1799.00 on an “AlkaViva Vesta H2 Water Ionizer” to produce water with a pH of 9.5? (This gizmo also claims to somehow put “molecular hydrogen” into your water, and I suppose it might, but only very temporarily: unlike carbon dioxide, hydrogen is very insoluble. Also, I’m a bit worried that machine might explode.)

Fear not, I am here to save your pennies! You do not need to buy special bottled water, and you DEFINITELY don’t need a machine costing £1.8k (I mean, really?) No, all you need is a tub of….

… baking soda!

Yep, good old sodium bicarbonate, also known as sodium hydrogencarbonate, bicarb, or NaHCO3. You can buy a 200 g tub for a pound or so, and that will make you litres and litres and litres of alkaline water. Best of all, it’s MADE for baking, so you know it’s food grade and therefore safe to eat (within reason, don’t eat the entire tub in one go).

All you need to do is add about a quarter of a teaspoon of aforementioned baking soda to a large glass of water and stir. It dissolves fairly easily. And that’s it – alkaline water for pennies!

Me* unconvinced by the flavour of alkaline water (*actually me).

Fair warning, if you drink a lot of this it might give you a bit of gas: once the bicarb hits your stomach acid it will react to form carbon dioxide – but it’s unlikely to be worse than drinking a fizzy drink. It also contains sodium, so if you’ve been told to watch your sodium intake, don’t do this.

If I had fewer scruples I’d set up shop selling “dehydrated alkaline water, just add water”.

Sigh. I’ll never be rich.

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13 thoughts on “Alkaline water: if you like it, why not make your own?

  1. “Hey look! I just bought me some alkaline water!”
    “Yep, that’s right!”

    (sorry, couldn’t help myself …)
    And judging by your photograph, the consumption of alkaline water produces a sour facial expression… Now that is interesting…

    Liked by 1 person

      • Thanks 🙂 Unfortunately, there’s little humour in science as it is, which may actually be quite natural and proper, as science mostly deals with facts, not emotions. And in circles of woo criticism, humour is usually limited to sarcasm, cynicism and (pardon my French, er, German(*)) schadenfreude.

        But with you, there’s a certain … um … chemistry?

        *: Talking of German, you know the old saying “Sauer macht lustig”? I think it’s quite appropriate for this occasion…


  2. Our water here is a tad hard, but not as bad as one place I worked. We used to have a ‘Burco’ boiler that was on all day, every day. It was cleaned out at cease work, and we used to remove nearly 4″ of scale from the bottom. That was every day! On the other end of the scale (ha ha) at my mum’s, the water is so soft, the amount of lather basic bar soap creates is phenomenal. Never measured the Ph though.

    Fascinating stuff, though. I wish I had no ethics or morals either, could make a fancy box with flashing lights and create something like ‘Radiation free irradiated honey water with added Himalayan bees’ or something….

    Liked by 1 person

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  5. The reason for the health effects is not the alkalinity but likely because of the H2 (molecular hydrogen) produced on the electrolyzing plate as long the plates are clean and free of scale. This can produce a detectable amount of dissolved hydrogen. When those machines became the rage nobody had any idea that molecular hydrogen was responsible for health effects. The water machines aren’t very good at producing hydrogen since they weren’t designed for that purpose, but studies are showing that even 1 ppm of H2 can have beneficial health effects. Animal and now human studies indicate that H2 benefits about 170 different medical conditions and can affect about 500 different genes. Search the terms “medical hydrogen gas”, “molecular hydrogen”, “H2”, “hydrogen primal antioxidant”, “hydrogen inhalation therapy”, “drinking hydrogen infused water”. Do not be tempted to confuse molecular hydrogen (H2) with hydrogen peroxide (H2O2).


    • Hydrogen gas (i.e. “molecular hydrogen”, H2) is insoluble in water. If you produce hydrogen in water, it immediately bubbles out. Anyone who’s ever dropped a piece of magnesium into dilute acid can attest to this. At room temperature, about 0.00016 grams of hydrogen dissolve in 100 grams (100 mls) of water.

      I do not believe that these quantities of gas have any health benefits, or indeed that you wouldn’t find – if you tested it – that ordinary tap water also contains very tiny quantities of H2.


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