Baking Soda

Hi my friends !!!
I was navigating....and I read about the baking soda for a vaginal acidic ph. 
one of the articles explain that depending of the vaginal ph the acid can kill the sperm, and it is another issue for women who are TTC. 
I would like to know what do you know about this? How can I know if I have an acid PH and if one of you had a positive result...
Thank you!!! 😘