On Facebook, the following was asked:
My daughter took a stomach acid test with bicarbonate. She burped after 51 seconds. If you burp after 1 to 2 minutes, it means that you have normal stomach acid. So my question is. Her doctor still wants her to take butyric acid (Butycap). The doctor says it does not matter that my daughter has normal stomach acid. He said Butyric acid is important for intestinal health and is recognized as the main source of energy for the colon epithelium or intestinal barrier or intestinal mucosa, the epithelial cells that make up the thin layer of a mucous membrane covering the intestinal surface. But I am afraid it could be too much stomach acid? Isn’t it that everything should be in balance?
This type of test is common in alternative medicine (and some traditional MDs). A good example is given here. The key factor is that you appear to be testing HCl (hydrochloric acid)
All Acids are Not the Same
A long time ago, I taught some chemistry courses at Vancouver City College in B.C. Canada. Some acids will not react to bicarbonate. Consider
Acetylsalicylic acid (commonly known as Aspirin!!) or even vinegar, it will react but at a different speed — that is the key: speed of reaction. This can be influence by temperature and other factors.
Stomach Acid is hydrochloric acid ONLY
Gastric acid, gastric juice or stomach acid, is a digestive fluid formed in the stomach and is composed of hydrochloric acid (HCl), potassium chloride (KCl) and sodium chloride (NaCl).https://en.wikipedia.org/wiki/Gastric_acid
Butyric Acid Sources
For benefits see: Butyric acid – a well-known molecule revisited 
The species of bacteria involved in the production of butyrate are Clostridium spp,Eubacterium spp., Fusobacterium spp., Butyrivibrio spp., Megasphaera elsdenii, Mitsuokella multiacida, Roseburia intestinalis, Faecalibacterium prausnitzii and Eubacterium hallii . Recently, an increased intake of highly processed, low-fibre food products rich in simple sugars has been observed, resulting in low levels of butyrate production in the intestinal lumen.
Butyric acid in irritable bowel syndrome 
Buying capsules is always one solution, but often an expensive path,
Butter contains significant amounts of butyric acid (a low molecular weight fatty acid) which is volatile and makes a significant contribution to the flavour of the fat.
Stanley P. Cauvain, in Baking Problems Solved (Second Edition), 2017
Butter contains 290 mg of butyric acid for 10 grams (1/3 of a oz – or 1/48th of a pound of butter). For a fuller food list see this page. 1 lb of butter = 290 * 48 = 13.9 gram. Using France’s cost this amounts to 0.20 Euro per gram of butyric acid
For the supplement path, let us look at this item selling for 40 Euros for 30 sachets containing 787mg each. Total 23.6 grams or 1.69 Euro per gram
of butyric acid .
Taking butyric acid will not impact stomach acid. As with all supplements, a little research can reduce you supplement coasts by a factor of 10 often (as also seen in my last post).